In the case of Ray v. Blair, 1951, the U.S. Supreme Court ruled that a state political party has the right to require its members to pledge their support for the party's nominees in order to be considered as delegates at national conventions. The decision came after an Alabama Democrat refused such a pledge and was subsequently denied his position as delegate by his state's Democratic Party chairman. He sued on grounds that this violated his rights under both federal law and constitutionally protected freedom of association but lost in lower courts before appealing to the Supreme Court. In a 5-2 ruling, it held that while citizens have broad voting rights protections under constitutional law, these do not extend into internal procedures of political parties which are private associations rather than public institutions.

In the dissenting opinion for Ray v. Blair, Justice Robert H. Jackson argued that political parties should have the right to set their own rules and standards without interference from state law or courts. He contended that a party's decision to require loyalty pledges from its electors is an internal matter and not subject to judicial review unless it violates constitutional rights or principles. According to him, such pledges are part of the democratic process as they help ensure that elected officials represent the will of their constituents rather than pursuing personal agendas once in office. Furthermore, he expressed concern about potential abuses if states were allowed too much control over how parties operate and select candidates.