OLYMPIA, Wash. (AP) -- The state Democratic and Libertarian parties are asking the U.S. Supreme Court to hear another challenge of Washington state's top two primary system, which the nation's highest court upheld in 2008.
The parties filed the request with the court late Wednesday.
The system has undergone several court challenges since it was adopted by Washington's voters in 2004, after the old "blanket primary" system was deemed unconstitutional. Under the top two primary system, the top two vote-getters advance to the general election regardless of party affiliation and their party preferences are listed on the ballot.
The political parties don't like the system because it means they won't necessarily have a candidate in the general election and because candidates they don't like can write "prefers Democratic Party" or "prefers Republican Party" on the ballot.