Mb. Justice Brennan
delivered the opinion of the Court.
At the March 1972 Illinois primary election, Chicago’s Democratic voters elected the 59 respondents (Wigoda [479]*479delegates) as delegates to the 1972 Democratic National Convention to be held in July 1972 in Miami, Fla. Some of the 59 petitioners (Cousins delegates) challenged the seating of the Wigoda delegates before the Credentials Committee of the National Democratic Party on the ground, among others, that the slate-making procedures under which the Wigoda delegates were selected violated Party guidelines incorporated in the Call of the Convention. On June 30, 1972, the Credentials Committee sustained the Findings and Report of a Hearing Officer that the Wigoda delegates had been chosen in violation of the guidelines,1 and also adopted the Hearing Offi[480]*480cer’s recommendation that the Wigoda delegates be unseated and the Cousins delegates (who had been chosen in June at private caucuses in Chicago) be seated in their stead.
On July 8, 1972, two days before the Convention opened, the Wigoda delegates obtained from the Circuit Court of Cook County, Ill., an injunction that enjoined each of the 59 petitioners “from acting or purporting to act as a delegate to the Democratic National Convention . . . [and] from performing the functions of delegates . . . [and] from receiving or accepting any credentials, badges or other indicia of delegate status . ...”2 [481]*481Nevertheless when the Convention on July 10 adopted the Credentials Committee’s recommendation and seated the Cousins delegates, they took their seats and participated fully as delegates throughout the Convention. In consequence, proceedings to adjudge petitioners in criminal contempt of the July 8 injunction are pending in the Circuit Court awaiting this Court’s decision in this case.
The Illinois Appellate Court affirmed the injunction, 14 Ill. App. 3d 460, 302 N. E. 2d 614 (1973),3 and the Supreme Court of Illinois, without opinion, on November 29, 1973, denied leave to appeal. The Appellate Court held that “[t]he right to sit as a delegate representing Illinois at the national nominating convention is governed exclusively by the Illinois Election Code,” id.., [482]*482at 472, 302 N. E. 2d, at 626, and rejected the Cousins delegates’ contention that the injunction attempting to enforce that Code, by preventing them from participating as delegates at the Convention, violated their right, and the right of the National Democratic Party, to freedom of political activity and association assured them under the First and Fourteenth Amendments. The Appellate Court stated:
“[T]he purposes and guidelines for reform adopted by the Democratic National Party in its Call for the 1972 Democratic National Convention ... in no way take precedence in the State of Illinois over the Illinois Election Code (Ill. Rev. Stat. 1971, ch. 46, § 7-1 et seq.). The opening section of Article 7 of the Election Code, which deals with the making of nominations by political parties (§ 7-1), is most clear when in discussing the selection of delegates to National nominating conventions, it states:
. [Delegates and alternate delegates to National nominating conventions by all political parties . . . shall be made in the manner provided in this Article 7, and not otherwise.’ ” Id., at 471, 302 N. E. 2d, at 625.
“[T]he law of the state is supreme and party rules to the contrary are of no effect....” Id., at 475, 302 N. E. 2d, at 627.
“The interest of the state in protecting the effective right to participate in primaries is superior to whatever other interests the party itself might wish to protect. . . .” Id., at 477, 302 N. E. 2d, at 629.
“Since [respondents] were admittedly elected to the position of delegates to the 1972 Democratic National Convention by operation of the Election Code, an Illinois statute, this court finds the trial court’s [483]*483injunctions did not abrogate [petitioners’] fundamental constitutional rights of free political association. ..Id., at 479, 302 N. E. 2d, at 631.
We granted certiorari to decide the important question presented whether the Appellate Court was correct in according primacy to state law over the National Political Party’s rules in the determination of the qualifications and eligibility of delegates to the Party’s National Convention. 415 U. S. 956 (1974) ,4 We reverse.
[484]*484I
There is a threshold question to be decided before we discuss the merits of the constitutional issue. During June and July 1972 the District Court for the District of Columbia and the Court of Appeals for the District ofi Columbia Circuit twice considered an action brought by one of the Wigoda delegates, Thomas E. Keane, against the National Democratic Party. That action challenged the constitutionality of the Party guidelines allegedly violated in the selection of the Wigoda delegates. The Cousins delegates intervened and the Party counterclaimed for an injunction enjoining the Wigoda delegates! from proceeding with the state-court action. The case was initially dismissed on appeal because the Credentials Committee had not yet decided the petitioners’ challenge, Keane v. National Democratic Party, No. 1010-72 (DC June 19, 1972); Keane v. National Democratic Party, [485]*485No. 72-1562 (DC Cir. June 20, 1972). After the Credentials Committee announced its adoption of the Hearing Officer’s Findings and Report, the suit proceeded. The District Court sustained the constitutionality of Guideline C-6, see n. 1, supra, and dismissed Keane’s suit, while denying the counterclaim. The Court of Appeals, on July 5, affirmed the dismissal but granted the counterclaim directing the entry of an order enjoining the Wigoda delegates from proceeding with the Circuit Court suit. Brown v. O’Brien, 152 U. S. App. D. C. 157, 469 F. 2d 563. This Court, however, at a Special Term on July 7, stayed the judgment of the Court of Appeals, 409 U. S. 1. On October 10, 1972, we granted Keane’s petition for certiorari, vacated the judgment of the Court of Appeals, and remanded for a determination of mootness. 409 U. S. 816. The Court of Appeals, on February 16, 1973, held the case moot insofar as it concerned seating of delegates at the July Convention, found no basis for relief as to any other matter, and entered a judgment affirming the District Court’s order of July 3 dismissing Keane’s suit, 155 U. S. App. D. C. 18, 475 F. 2d 1287.
Based upon these events, petitioners argue that the Illinois Circuit Court was without jurisdiction to enter its July 8 injunction notwithstanding this Court’s July 7 stay of the Court of Appeals’ judgment. The argument relies upon the reference in the Court’s per curiam opinion supporting the stay to “the large public interest in allowing the political processes to function free from judicial supervision,” 409 U. S., at 5, which, petitioners argue, “established the right, in the particular circumstances of this case, of the 1972 Democratic National Convention to decide the Chicago credentials contest.” Brief for Petitioners 20. The argument is without merit. The per .curiam
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Mb. Justice Brennan
delivered the opinion of the Court.
At the March 1972 Illinois primary election, Chicago’s Democratic voters elected the 59 respondents (Wigoda [479]*479delegates) as delegates to the 1972 Democratic National Convention to be held in July 1972 in Miami, Fla. Some of the 59 petitioners (Cousins delegates) challenged the seating of the Wigoda delegates before the Credentials Committee of the National Democratic Party on the ground, among others, that the slate-making procedures under which the Wigoda delegates were selected violated Party guidelines incorporated in the Call of the Convention. On June 30, 1972, the Credentials Committee sustained the Findings and Report of a Hearing Officer that the Wigoda delegates had been chosen in violation of the guidelines,1 and also adopted the Hearing Offi[480]*480cer’s recommendation that the Wigoda delegates be unseated and the Cousins delegates (who had been chosen in June at private caucuses in Chicago) be seated in their stead.
On July 8, 1972, two days before the Convention opened, the Wigoda delegates obtained from the Circuit Court of Cook County, Ill., an injunction that enjoined each of the 59 petitioners “from acting or purporting to act as a delegate to the Democratic National Convention . . . [and] from performing the functions of delegates . . . [and] from receiving or accepting any credentials, badges or other indicia of delegate status . ...”2 [481]*481Nevertheless when the Convention on July 10 adopted the Credentials Committee’s recommendation and seated the Cousins delegates, they took their seats and participated fully as delegates throughout the Convention. In consequence, proceedings to adjudge petitioners in criminal contempt of the July 8 injunction are pending in the Circuit Court awaiting this Court’s decision in this case.
The Illinois Appellate Court affirmed the injunction, 14 Ill. App. 3d 460, 302 N. E. 2d 614 (1973),3 and the Supreme Court of Illinois, without opinion, on November 29, 1973, denied leave to appeal. The Appellate Court held that “[t]he right to sit as a delegate representing Illinois at the national nominating convention is governed exclusively by the Illinois Election Code,” id.., [482]*482at 472, 302 N. E. 2d, at 626, and rejected the Cousins delegates’ contention that the injunction attempting to enforce that Code, by preventing them from participating as delegates at the Convention, violated their right, and the right of the National Democratic Party, to freedom of political activity and association assured them under the First and Fourteenth Amendments. The Appellate Court stated:
“[T]he purposes and guidelines for reform adopted by the Democratic National Party in its Call for the 1972 Democratic National Convention ... in no way take precedence in the State of Illinois over the Illinois Election Code (Ill. Rev. Stat. 1971, ch. 46, § 7-1 et seq.). The opening section of Article 7 of the Election Code, which deals with the making of nominations by political parties (§ 7-1), is most clear when in discussing the selection of delegates to National nominating conventions, it states:
. [Delegates and alternate delegates to National nominating conventions by all political parties . . . shall be made in the manner provided in this Article 7, and not otherwise.’ ” Id., at 471, 302 N. E. 2d, at 625.
“[T]he law of the state is supreme and party rules to the contrary are of no effect....” Id., at 475, 302 N. E. 2d, at 627.
“The interest of the state in protecting the effective right to participate in primaries is superior to whatever other interests the party itself might wish to protect. . . .” Id., at 477, 302 N. E. 2d, at 629.
“Since [respondents] were admittedly elected to the position of delegates to the 1972 Democratic National Convention by operation of the Election Code, an Illinois statute, this court finds the trial court’s [483]*483injunctions did not abrogate [petitioners’] fundamental constitutional rights of free political association. ..Id., at 479, 302 N. E. 2d, at 631.
We granted certiorari to decide the important question presented whether the Appellate Court was correct in according primacy to state law over the National Political Party’s rules in the determination of the qualifications and eligibility of delegates to the Party’s National Convention. 415 U. S. 956 (1974) ,4 We reverse.
[484]*484I
There is a threshold question to be decided before we discuss the merits of the constitutional issue. During June and July 1972 the District Court for the District of Columbia and the Court of Appeals for the District ofi Columbia Circuit twice considered an action brought by one of the Wigoda delegates, Thomas E. Keane, against the National Democratic Party. That action challenged the constitutionality of the Party guidelines allegedly violated in the selection of the Wigoda delegates. The Cousins delegates intervened and the Party counterclaimed for an injunction enjoining the Wigoda delegates! from proceeding with the state-court action. The case was initially dismissed on appeal because the Credentials Committee had not yet decided the petitioners’ challenge, Keane v. National Democratic Party, No. 1010-72 (DC June 19, 1972); Keane v. National Democratic Party, [485]*485No. 72-1562 (DC Cir. June 20, 1972). After the Credentials Committee announced its adoption of the Hearing Officer’s Findings and Report, the suit proceeded. The District Court sustained the constitutionality of Guideline C-6, see n. 1, supra, and dismissed Keane’s suit, while denying the counterclaim. The Court of Appeals, on July 5, affirmed the dismissal but granted the counterclaim directing the entry of an order enjoining the Wigoda delegates from proceeding with the Circuit Court suit. Brown v. O’Brien, 152 U. S. App. D. C. 157, 469 F. 2d 563. This Court, however, at a Special Term on July 7, stayed the judgment of the Court of Appeals, 409 U. S. 1. On October 10, 1972, we granted Keane’s petition for certiorari, vacated the judgment of the Court of Appeals, and remanded for a determination of mootness. 409 U. S. 816. The Court of Appeals, on February 16, 1973, held the case moot insofar as it concerned seating of delegates at the July Convention, found no basis for relief as to any other matter, and entered a judgment affirming the District Court’s order of July 3 dismissing Keane’s suit, 155 U. S. App. D. C. 18, 475 F. 2d 1287.
Based upon these events, petitioners argue that the Illinois Circuit Court was without jurisdiction to enter its July 8 injunction notwithstanding this Court’s July 7 stay of the Court of Appeals’ judgment. The argument relies upon the reference in the Court’s per curiam opinion supporting the stay to “the large public interest in allowing the political processes to function free from judicial supervision,” 409 U. S., at 5, which, petitioners argue, “established the right, in the particular circumstances of this case, of the 1972 Democratic National Convention to decide the Chicago credentials contest.” Brief for Petitioners 20. The argument is without merit. The per .curiam did not decide the question before us in this case. [486]*486The stay order, in terms, unambiguously suspended the operative effect of the Court of Appeals’ judgment without qualification and in its entirety, and nothing in the quoted excerpt from the per curiam opinion in any wise qualified that effect.5 We agree with the Illinois Appellate Court, therefore, that the stay order “completely froze the order of the Court of Appeals, including the injunction order directed to the Circuit Court of Illinois, thereby allowing the Circuit Court to proceed.” 14 Ill. App. 3d, at 468,302 N. E. 2d, at 622-623.
Petitioners argue further that in any event the stay order “did not alter the binding collateral estoppel and res judicata effect of that [Court of Appeals] judgment so as to permit collateral attack in the Illinois state courts.” Brief for Petitioners 28. We need not address the merits of that argument. The Illinois Appellate Court rejected it on the ground that the res judicata defense had not been pleaded and proved in the Circuit Court as required by Illinois law established in Svalina v. Saravana, 341 Ill. 236, 173 N. E. 281 (1930). 14 Ill. App. 3d, at 469, 302 N. E. 2d, at 623.6 We have no basis for disagreement with the holding of the Appellate Court [487]*487“that the [petitioners] neither formally pleaded nor attempted to prove their claim of res judicata based on the decision of the Court of Appeals for the District of Columbia Circuit.” Ibid.7 This constitutes an adequate state ground that forecloses any jurisdiction that we might possess to review the merits of the res judicata defense. See, e. g., Louisville & N. R. Co. v. Woodford, 234 U. S. 46 (1914). Accordingly, we turn to consideration of the merits of the constitutional question.
II
The National Democratic Party and its adherents enjoy a constitutionally protected right of political association. “There can no longer be any doubt that freedom to associate with others for the common advancement of political beliefs and ideas is a form of 'orderly group activity’ protected by the First and Fourteenth Amendments. . . . The right to associate with the political party of one’s choice is an integral part of this basic constitutional freedom.” Kusper v. Pontikes, 414 U. S. 61, 56-57 (1973). “And of course this freedom protected against federal encroachment by the First Amendment is entitled under the Fourteenth Amendment to the same protection from infringement by the States.” Williams v. Rhodes, 393 U. S. 23, 30-31 (1968). Moreover, “[a]ny interference with the freedom of a party is simultaneously an interference with the freedom of its adher[488]*488ents.” Sweezy v. New Hampshire, 354 U. S. 234, 250 (1957); see NAACP v. Button, 371 U. S. 415, 431 (1963).
Petitioners rely upon these principles and contend that, since the July 8 Circuit Court injunction was fashioned to effectuate state law by barring them from serving as delegates at their Party’s National Convention, the injunction constituted an unconstitutional “significant interference” with protected rights of political association. Bates v. Little Rock, 361 U. S. 516, 523 (1960); see also Kusper v. Pontikes, supra, at 58.
The Illinois Appellate Court conceded that petitioners and the Party enjoyed “fundamental constitutional rights of free political association.” 14 Ill. App. 3d, at 470, 302 N. F. 2d, at 624. The Appellate Court justified the injunction, however, on the ground that the “interest of the state in protecting the effective right to participate in primaries is superior to whatever other interests the party itself might wish to protect.” Id., at 477, 302 N. E. 2d, at 629. In other words, the Appellate Court identified as the State’s legitimate interest the protection of votes cast at the primary from the impairment that would result from stripping the respondents of their elected-delegate status.
We observe at the outset that petitioners’ compliance with the injunction would not have assured effectuation of the state objective to seat respondents at the Convention. The Convention was under no obligation to seat the respondents but was free, as respondents concede,8 to leave the Chicago seats vacant and thus defeat the objective.
[489]*489We proceed, however, to considering whether the asserted state interest justifies the injunction. Even though legitimate, the “ 'subordinating interest of the State must be compelling’. . to justify the injunction’s abridgment of the exercise by petitioners and the National Democratic Party of their constitutionally protected rights of association. NAACP v. Alabama, 357 U. S. 449, 463 (1958).
Respondents argue that Illinois had a compelling interest in protecting the integrity of its electoral processes and the right of its citizens under the State and Federal Constitutions to effective suffrage. They rely on the numerous statements of this Court that the right to vote is a “fundamental political right, because preservative of all rights.” Yick Wo v. Hopkins, 118 U. S. 356, 370 (1886); Reynolds v. Sims, 377 U. S. 533, 562 (1964) ; Williams v. Rhodes, 393 U. S., at 31; Kramer v. Union School District, 395 U. S. 621, 626 (1969); Dunn v. Blumstein, 405 U. S. 330, 336 (1972). But respondents overlook the significant fact that the suffrage was exercised at the primary election to elect delegates to a National Party Convention. Consideration of the special function of delegates to such a Convention militates persuasively against the conclusion that the asserted interest constitutes a compelling state interest. Delegates perform a task of supreme importance to every citizen of the Nation regardless of their State of residence. The vital business of the Convention is the nomination of the Party’s candidates for the offices of President and Vice President of the United States. To that end, the state political parties are “affiliated with a national party through acceptance of the national call to send state delegates to the national convention.” Ray v. Blair, 343 U. S. 214, 225 (1952). The States themselves have no constitutionally mandated role in the great task of the [490]*490selection of Presidential and Vice-Presidential candidates.9 If the qualifications and eligibility of delegates, to National Political Party Conventions were left to state law “each of the fifty states could establish the qualifications of its delegates to the various party conventions without regard to party policy, an obviously intolerable-result.” Wigoda v. Cousins, 342 F. Supp. 82, 86 (ND Ill.1972). Such a regime could seriously undercut or indeed, destroy the effectiveness of the National Party Convention as a concerted enterprise engaged in the vital process of choosing Presidential and Vice-Presidential candidates— a process which usually involves coalitions cutting across state lines.10 The Convention serves the pervasive national interest in the selection of candidates for national office, and this national interest is greater than any interest of an individual State. The paramount necessity for effective performance of the Convention’s task is underscored by Mr. Justice Pitney’s admonition “that the likelihood of a candidate succeeding in an election without a party nomination is practically negligible. . . . As a practical matter, the ultimate choice of the mass of voters is predetermined when the nominations have been made.” Newberry v. United States, 256 U. S. 232, 286 (1921) (dissenting opinion).
[491]*491Thus, Illinois’ interest in protecting the integrity of its electoral process cannot be deemed compelling in the context of the selection of delegates to the National Party Convention. Whatever the case of actions presenting claims that the Party’s delegate selection procedures are not exercised within the confines of the Constitution— and no such claims are made here — this is a case where “the convention itself [was] the proper forum for determining intra-party disputes as to which delegates [should] be seated.” O’Brien v. Brown, 409 U. S. 1, 4 (1972).
Reversed.