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Despite the proliferation of candidates under the new rules, analysts predict low voter turnout, citing the lack of suspense in the presidential primaries. Both the Democrat Obama and Republican Mitt Romney are expected to coast to victory in their party primaries.

More action is expected in the congressional and legislative primaries, where the new election rules could result in dozens of races in which the top two candidates belong to the same party. Mr. Hoffenblum predicts that as many as 34 contests could result in intraparty rivalries in November.

Eight of those are congressional races. For instance, in the 30th Congressional District in the San Fernando Valley, Democratic Reps. Howard L. Berman and Brad Sherman are expected to capture the top two slots after being drawn into the same district.

In the 15th District, longtime Democratic Rep. Fortney Pete Stark could be in trouble after drawing several Democratic challengers. Mr. Stark, considered one of the most liberal members of Congress, could find himself up against a more moderate Democrat who would attract support from Republican and centrist voters.

“If he’s running against a Democrat, Stark can’t go out and yell that ‘Republicans are going to take away your Social Security,’” said Mr. Hoffenblum. “The winner is going to be the one to get crossover votes. The whole concern is that you can’t get elected by your party base alone, and I think the result is that you’re going to see some incumbents in trouble.”