Chief Justice Burger
delivered the opinion of the Court.
The question presented by this appeal is whether Puerto Rico may by statute vest in a political party the power to fill an interim vacancy in the Puerto Rico Legislature. The Supreme Court of Puerto Rico held that such a procedure did not violate the United States Constitution. We noted probable jurisdiction, 454 U. S. 938 (1981), and we affirm.
I
In the November 4, 1980, Puerto Rico general election, Ramon Muniz, a member of appellee Popular Democratic Party, was elected to the Puerto Rico House of Representatives from District 31.
Muniz died on January 28, 1981. The Governor of Puerto Rico, a member of the opposition New Progressive Party, subsequently called for a “by-election” — open to all qualified voters in District 31 — to fill the vacancy caused by Muniz’ death. The Governor purported to act pursuant to Articles 5.006 and 5.007 of the Electoral Law of Puerto Rico, P. R. Laws Ann., Tit. 16, §§3206, 3207 (Supp. 1980).
On March 3, 1981, the Popular Democratic Party instituted this action in the Superior Court of Puerto Rico, alleging that Articles 5.006 and 5.007 authorized only candidates and electors affiliated with the Party to participate in the by-election. Appellants, 10 qualified electors in District 31 who are not affiliated with the Popular Democratic Party, intervened as defendants. On March 20,1981, the Superior Court entered judgment for the Popular Democratic Party; it ordered the Governor and General Administrator of Elections to limit participation in the by-election to Party members. App. to Juris. Statement 36a.
A divided Supreme Court of Puerto Rico modified the Superior Court’s judgment. It interpreted Articles 5.006 and 5.007 to require a by-election only in the event that the party of the legislator vacating the seat fails to designate a replacement within 60 days after the vacancy occurred; if the party selects a single candidate within the 60-day period, that candidate is “automatically elected to fill the vacancy,” rendering a by-election unnecessary.
Popular Democratic Party
v. Barcelo, — P. R. R. —, — (1981). The court held further that if the party presents more than one candidate during the 60-day period, a by-election must be conducted in
which only party-affiliated candidates may run but in which all qualified electors may vote. In the event no candidate is presented within the 60-day period, candidates affiliated with any party, as well as independent candidates, are permitted to run in the by-election. Because of the delay already occasioned by the litigation, the court permitted appellee Party only 30 days from the entry of judgment, May 8, 1981, to present a “slate” of candidates to the Commonwealth Election Commission. The court ordered that “[i]f said slate is limited to only one candidate, he shall be certified by the General Administrator of Elections as the person entitled to hold the vacant seat.”
Id.,
at-.
The court rejected appellants’ contention that this procedure violated the United States Constitution. It noted that the Constitution does not expressly require a fixed method for filling vacancies in a state or commonwealth legislature. The court also held that Puerto Rico’s party appointment system serves several “compelling interests,” such as ensuring the stability and continuity of the “legislative balance” until the next general election; protecting the “electoral mandate” of the previous election; and reducing “inter-partisan political campaigns to once every four years.”
Id.,
at-.
II
Puerto Rico, in common with many of the States, has adopted means of filling interim vacancies in elective commonwealth offices without the necessity of a full-scale special election.
If a vacancy occurs in the office of Governor, it is
automatically filled by the Secretary of State, an officer appointed by the Governor. P. E. Const., Art. IV, §7. Mayoral vacancies and vacancies in the municipal assemblies are filled by appointment upon the recommendation of the political party to which the incumbent belonged. P. R. Laws Ann., Tit. 21, §§ 1161, 1259 (1974). Similarly, the Commonwealth Constitution provides that vacancies in the posts of at-large senators and representatives, see n. 13,
infra,
shall be filled “upon recommendation of the political party to which belonged the Senator or Representative causing the vacancy . . . .” Art. Ill, §8. Article 5.006 of the Puerto Rico Electoral Law, as interpreted by the Supreme Court of Puerto Rico in this case, likewise confers on a political party the initial opportunity to appoint an interim replacement for one of its members who vacates a position as a district sena
tor or representative. In each case, the appointee serves only until the next regularly scheduled election.
Appellants’ challenge to the procedure mandated by Article 5.006 is essentially two-pronged. Appellants first contend that qualified voters have a federal constitutional right to elect their representatives to the Puerto Rico Legislature, and that vacancies in legislative offices therefore must be filled by a special election open to all qualified electors, not by interim appointment of any kind. Alternatively, appellants maintain that even if legislative vacancies may be filled by an interim appointment of the Governor or some other elected official, Puerto Rico’s party appointment mechanism imper-missibly infringes upon their right of association under the First Amendment and denies them equal protection of the laws.
A
It is not disputed that the fundamental protections of the United States Constitution extend to the inhabitants of Puerto Rico. See
Torres
v.
Puerto Rico,
442 U. S. 465, 469-470 (1979). Cf.
Dorr
v.
United States,
195 U. S. 138, 148 (1904). In particular, we have held that Puerto Rico is subject to the constitutional guarantees of due process and equal protection of the laws.
Examining Board
v.
Flores de Otero,
426 U. S. 572, 599-601 (1976);
Calero-Toledo
v.
Pearson Yacht Leasing Co.,
416 U. S. 663 (1974).
We thus think
it is clear that the voting rights of Puerto Rico citizens are constitutionally protected to the same extent as those of all other citizens of the United States.
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Chief Justice Burger
delivered the opinion of the Court.
The question presented by this appeal is whether Puerto Rico may by statute vest in a political party the power to fill an interim vacancy in the Puerto Rico Legislature. The Supreme Court of Puerto Rico held that such a procedure did not violate the United States Constitution. We noted probable jurisdiction, 454 U. S. 938 (1981), and we affirm.
I
In the November 4, 1980, Puerto Rico general election, Ramon Muniz, a member of appellee Popular Democratic Party, was elected to the Puerto Rico House of Representatives from District 31.
Muniz died on January 28, 1981. The Governor of Puerto Rico, a member of the opposition New Progressive Party, subsequently called for a “by-election” — open to all qualified voters in District 31 — to fill the vacancy caused by Muniz’ death. The Governor purported to act pursuant to Articles 5.006 and 5.007 of the Electoral Law of Puerto Rico, P. R. Laws Ann., Tit. 16, §§3206, 3207 (Supp. 1980).
On March 3, 1981, the Popular Democratic Party instituted this action in the Superior Court of Puerto Rico, alleging that Articles 5.006 and 5.007 authorized only candidates and electors affiliated with the Party to participate in the by-election. Appellants, 10 qualified electors in District 31 who are not affiliated with the Popular Democratic Party, intervened as defendants. On March 20,1981, the Superior Court entered judgment for the Popular Democratic Party; it ordered the Governor and General Administrator of Elections to limit participation in the by-election to Party members. App. to Juris. Statement 36a.
A divided Supreme Court of Puerto Rico modified the Superior Court’s judgment. It interpreted Articles 5.006 and 5.007 to require a by-election only in the event that the party of the legislator vacating the seat fails to designate a replacement within 60 days after the vacancy occurred; if the party selects a single candidate within the 60-day period, that candidate is “automatically elected to fill the vacancy,” rendering a by-election unnecessary.
Popular Democratic Party
v. Barcelo, — P. R. R. —, — (1981). The court held further that if the party presents more than one candidate during the 60-day period, a by-election must be conducted in
which only party-affiliated candidates may run but in which all qualified electors may vote. In the event no candidate is presented within the 60-day period, candidates affiliated with any party, as well as independent candidates, are permitted to run in the by-election. Because of the delay already occasioned by the litigation, the court permitted appellee Party only 30 days from the entry of judgment, May 8, 1981, to present a “slate” of candidates to the Commonwealth Election Commission. The court ordered that “[i]f said slate is limited to only one candidate, he shall be certified by the General Administrator of Elections as the person entitled to hold the vacant seat.”
Id.,
at-.
The court rejected appellants’ contention that this procedure violated the United States Constitution. It noted that the Constitution does not expressly require a fixed method for filling vacancies in a state or commonwealth legislature. The court also held that Puerto Rico’s party appointment system serves several “compelling interests,” such as ensuring the stability and continuity of the “legislative balance” until the next general election; protecting the “electoral mandate” of the previous election; and reducing “inter-partisan political campaigns to once every four years.”
Id.,
at-.
II
Puerto Rico, in common with many of the States, has adopted means of filling interim vacancies in elective commonwealth offices without the necessity of a full-scale special election.
If a vacancy occurs in the office of Governor, it is
automatically filled by the Secretary of State, an officer appointed by the Governor. P. E. Const., Art. IV, §7. Mayoral vacancies and vacancies in the municipal assemblies are filled by appointment upon the recommendation of the political party to which the incumbent belonged. P. R. Laws Ann., Tit. 21, §§ 1161, 1259 (1974). Similarly, the Commonwealth Constitution provides that vacancies in the posts of at-large senators and representatives, see n. 13,
infra,
shall be filled “upon recommendation of the political party to which belonged the Senator or Representative causing the vacancy . . . .” Art. Ill, §8. Article 5.006 of the Puerto Rico Electoral Law, as interpreted by the Supreme Court of Puerto Rico in this case, likewise confers on a political party the initial opportunity to appoint an interim replacement for one of its members who vacates a position as a district sena
tor or representative. In each case, the appointee serves only until the next regularly scheduled election.
Appellants’ challenge to the procedure mandated by Article 5.006 is essentially two-pronged. Appellants first contend that qualified voters have a federal constitutional right to elect their representatives to the Puerto Rico Legislature, and that vacancies in legislative offices therefore must be filled by a special election open to all qualified electors, not by interim appointment of any kind. Alternatively, appellants maintain that even if legislative vacancies may be filled by an interim appointment of the Governor or some other elected official, Puerto Rico’s party appointment mechanism imper-missibly infringes upon their right of association under the First Amendment and denies them equal protection of the laws.
A
It is not disputed that the fundamental protections of the United States Constitution extend to the inhabitants of Puerto Rico. See
Torres
v.
Puerto Rico,
442 U. S. 465, 469-470 (1979). Cf.
Dorr
v.
United States,
195 U. S. 138, 148 (1904). In particular, we have held that Puerto Rico is subject to the constitutional guarantees of due process and equal protection of the laws.
Examining Board
v.
Flores de Otero,
426 U. S. 572, 599-601 (1976);
Calero-Toledo
v.
Pearson Yacht Leasing Co.,
416 U. S. 663 (1974).
We thus think
it is clear that the voting rights of Puerto Rico citizens are constitutionally protected to the same extent as those of all other citizens of the United States.
At the same time, Puerto Rico, like a state, is an autonomous political entity, “ ‘sovereign over matters not ruled by the Constitution.’”
Calero-Toledo, supra,
at 673 (quoting
Mora
v.
Mejias,
115 F. Supp. 610 (PR 1953)). See
Cordova & Simonpietri Ins. Agency Inc.
v.
Chase Manhattan Bank,
649 F. 2d 36, 39-42 (CA1 1981). The methods by which the people of Puerto Rico and their representatives have chosen to structure the Commonwealth’s electoral system are entitled to substantial deference. Moreover, we should accord weight to the Puerto Rico Supreme Court’s assessment of the justification and need for particular provisions to fill vacancies caused by the death, resignation, or removal of a member of the legislature. Bearing these considerations in mind, we turn to appellants’ constitutional challenges.
B
No provision of the Federal Constitution expressly mandates the procedures that a state or the Commonwealth of Puerto Rico must follow in filling vacancies in its own legislature. Cf. U. S. Const., Art. I, §2; Arndt. 17, cl. 2.
Appellants nevertheless maintain that qualified electors have an
absolute constitutional right to vote for the members of a state or commonwealth legislature, even when a special election is required for this purpose.
However, this Court has often noted that the Constitution “does not confer the right of suffrage upon any one,”
Minor
v.
Happersett,
21 Wall. 162, 178 (1875), and that “the right to vote,
per se,
is not a constitutionally protected right,”
San Antonio Independent School Dist.
v.
Rodriguez,
411 U. S. 1, 35, n. 78 (1973). See
McPherson
v.
Blacker,
146 U. S. 1, 38-39 (1892). Moreover, we have previously rejected claims that the Constitution compels a fixed method of choosing state or local officers or representatives.
For example, in
Fortson
v.
Morris,
385 U. S. 231, 234 (1966), Justice Black, speaking for the Court, stated:
“There is no provision of the United States Constitution or any of its amendments which either expressly or impliedly dictates the method a State must use to select its Governor.”
In
Fortson,
the Court sustained a Georgia constitutional provision empowering the state legislature to elect a Governor from the two candidates receiving the highest number of votes cast in the general election, in the event neither received a majority. Similarly, in
Sailors
v.
Board of Education,
387 U. S. 105 (1967), the Court upheld a statute au
thorizing appointment rather than election of the members of a county school board.
To be sure, when a state or the Commonwealth of Puerto Rico has provided that its representatives be elected, “a citizen has a constitutionally protected right to participate in elections on an equal basis with other citizens in the jurisdiction.”
Dunn
v.
Blumstein,
405 U. S. 330, 336 (1972). See
Kramer
v.
Union Free School District,
395 U. S. 621, 626-629 (1969);
Gray
v.
Sanders,
372 U. S. 368, 379-380 (1963). However, the Puerto Rico statute at issue here does not restrict access to the electoral process or afford unequal treatment to different classes of voters or political parties. All qualified voters have an equal opportunity to select a district representative in the general election; and the interim appointment provision applies uniformly to all legislative vacancies, whenever they arise.
In
Valenti
v.
Rockefeller,
393 U. S. 405 (1969), the Court sustained the authority of the Governor of New York to fill a
vacancy in the United States Senate by appointment pending the next regularly scheduled congressional election — in that case, a period of over 29 months.
Thus, although most Members of the United States Senate hold office by virtue of popular election, some Members, at any given time, may hold office by virtue of an interim appointment. The Court found nothing invidious or arbitrary in this distinction in
Valenti,
nor do we here. As the three-judge District Court observed in
Valenti:
“In this case we are confronted with no fundamental imperfection in the functioning of democracy. No political party or portion of the state’s citizens can claim it is permanently disadvantaged ... or that it lacks effective means of securing legislative reform if the statute is regarded as unsatisfactory. We have, rather, only the unusual, temporary, and unfortunate combination of a tragic event and a reasonable statutory scheme.”
Valenti
v.
Rockefeller,
292 F. Supp. 851, 867 (SDNY 1968).
Valenti,
of course, unlike this case, involved an interpretation of the Seventeenth Amendment, which explicitly outlines the procedures for filling vacancies in the United States Senate. See n. 7, supra. However, the fact that the Seventeenth Amendment permits a state, if it chooses, to forgo a special election in favor of a temporary appointment to the United States Senate suggests that a state is not constitutionally prohibited from exercising similar latitude with regard to vacancies in its own legislature. We discern nothing in the Federal Constitution that imposes greater constraints on the Commonwealth of Puerto Rico.
The Commonwealth’s choice to fill legislative vacancies by-appointment rather than by a full-scale special election may have some effect on the right of its citizens to elect the members of the Puerto Rico Legislature; however, the effect is minimal, and like that in
Valenti,
it does not fall disproportionately on any discrete group of voters, candidates, or political parties. See n. 10,
supra.
Moreover, the interim appointment system plainly serves the legitimate purpose of ensuring that vacancies are filled promptly, without the necessity of the expense and inconvenience of a special election. The Constitution does not preclude this practical and widely accepted means of addressing an infrequent problem.
C
Puerto Rico’s appointment mechanism is not rendered constitutionally defective by virtue of the fact that the interim appointment power is given to the political party with which the previous incumbent was affiliated. Appellants maintain that the power to make interim appointments must be vested in an elected official, such as the Governor of the Commonwealth, so that the appointments will have “the legitimacy of derivative voter approval and control.” Reply Brief for Appellants 15. However, that such control may often be largely illusory is illustrated by this case, where the Governor and the incumbent belonged to different parties. The Puerto Rico Legislature could reasonably conclude that appointment by the previous incumbent’s political party would more fairly reflect the will of the voters than appointment by the Governor or some other elected official.
The Supreme Court of Puerto Rico held that party appointment was a legitimate mechanism serving to protect the mandate of the preceding election and to preserve the “legislative balance” until the next general election is held. Such protection is particularly important in light of Puerto Rico’s special interest in ensuring minority representation in its legislature.
See
Garcia
v.
Barcelo,
671 F. 2d 1, 6-7 (CA1 1982). It was thus not unreasonable for the Puerto Rico Legislature, in establishing an appointment systemior filling legislative vacancies, to make provision for continuity of party representation. Cf.
Kaelin
v.
Warden,
334 F. Supp. 602, 607-608 (ED Pa. 1971) (three-judge District Court).
Absent some clear constitutional limitation, Puerto Rico is free
to structure its political system to meet its “special concerns and political circumstances,”
Garcia, supra,
at 7.
Finally, appellants argue that their rights of association and equal protection of the laws were violated by their exclusion, based solely upon their party affiliation, from the Party-sponsored election held to select Muniz' successor, see n. 3,
supra.
Cf.
Branti
v.
Finkel,
445 U. S. 507 (1980). However, appellants' argument misconceives the nature of the election held in this case. Puerto Rico law authorized the Popular Democratic Party to designate an interim replacement to fill Muniz’ seat. The Party was entitled to adopt its own procedures to select this replacement; it was not required to include nonmembers in what can be analogized to a party primary election. Cf.
Democratic Party of U. S.
v.
Wisconsin,
450 U. S. 107 (1981);
Cousins
v.
Wigoda,
419 U. S. 477 (1975). Appellants’ exclusion from this election did not violate their rights of association, nor did it deprive them of equal protection of the laws.
hH H
We hold that the mechanism adopted by the Puerto Rico Legislature for filling legislative vacancies is not foreclosed by the Federal Constitution. Accordingly, the judgment of the Supreme Court of Puerto Rico is
Affirmed.