WASHINGTON (AP) — This year's general election in at least seven California congressional districts will do away with the concept of Republican vs. Democrat. Instead, contenders from the same party will do battle.

California's revamped primary system, approved by voters in 2010, allows the top two candidates regardless of political affiliation to advance to the general election. The idea is to make the candidates appeal to a wider pool of voters.

The most competitive races involve Democratic Rep. Mike Honda and Republican Rep. Tom McClintock, two longtime players in California's political scene facing their first serious re-election challenges.

Washington state also has a top-two primary, while Louisiana has a similar system for its general election, including a runoff between the top two if neither wins a majority.