Definition and meaning of blanket primary: A blanket primary is a type of primary election process in which a single ballot is used to select candidates for multiple offices. This system is used in some U.S. states to allow voters to vote for candidates of any political party for an office, rather than having to vote for candidates from a single party. This system promotes increased voter turnout, as it allows voters to express their preferences across party lines. Additionally, it encourages more competition between parties by allowing crossover voting. The blanket primary has been criticized for potential violations of the First Amendment's guarantee of freedom of association. In 2000, the U.S. Supreme Court ruled in California Democratic Party v. Jones that the blanket primary system in California was unconstitutional. The Court found that the system impermissibly burdened the rights of political parties to choose their nominees in the way that they choose. In spite of the ruling, some states still have blanket primary systems in place. These include Alaska, Louisiana, and Washington. These systems differ from a regular primary system in that they allow voters to cast ballots for candidates of any party. This system has both advantages and disadvantages, as it gives broader choice to voters, but can also lead to vote splitting and reduced party loyalty.