Bumpy road for California Democrats targeting Republican House seats

By Sharon BernsteinSACRAMENTO, Calif. (Reuters) - As Californians prepare to go to the polls on Tuesday to choose candidates in primary elections, the state's quirky electoral rules and a softening of support for Democrats among suburban voters could disrupt the party's ambitious plan to wrest as many as 10 seats from Republicans in California.November's general election could change the balance of power in the U.S. Congress, where Republicans control both chambers.Democrats need to win 23 seats