In 1955 Connecticut adopted its present primary election system under which major parties select candidates for federal and statewide offices through statewide conventions of party delegates and district conventions for state legislative seats, with party-endorsed candidates required to receive more than 20 percent of the convention vote and any candidate receiving 20 percent permitted to challenge in a primary. The costs of primary elections are paid from public funds, and candidates selected by the major parties receive automatic ballot access in the general election. Conn. Gen. Stat. § 9-431 has required since that time that voters in any party primary be registered members of that party.
In 1976 a three-judge District Court upheld § 9-431 against a challenge by an independent voter seeking to participate in the Republican primary; at that time the Republican Party of Connecticut opposed the effort. By 1983 the Party had changed its position, citing the demographic importance of independent voters in the state. In September 1983 the Party's Central Committee recommended a state convention to consider altering party rules, and in January 1984 the convention adopted Rule 3 permitting any elector enrolled as a Republican or any elector not enrolled in any party to vote in Republican primaries for United States Senator, United States Representative, Governor, Lieutenant Governor, Secretary of the State, Attorney General, Comptroller, and Treasurer.
During the 1984 legislative session Republican leaders proposed amending § 9-431 to allow independents to vote in primaries when permitted by party rules, but the measure was defeated along party lines in the Democratic-controlled legislature. The Party and its federal officeholders and state chairman then sued state officials, including Secretary of the State Julia Tashjian, in the United States District Court for the District of Connecticut, seeking declaratory and injunctive relief. After discovery the parties submitted extensive stipulations of fact, and the District Court granted summary judgment for the Party in December 1984.
The Court of Appeals for the Second Circuit affirmed in 1985. The Supreme Court noted probable jurisdiction in 1986. At the time of the rule's adoption Connecticut had 659,268 registered Democrats, 425,695 registered Republicans, and 532,723 registered unaffiliated voters.