California: Top-two primary system is shaking up California elections | Los Angeles Times
When Rep. Gary Miller this week became the latest California congressman to throw in the towel, the Rancho Cucamonga Republican in effect delivered his district into Democrats' hands. While Miller's is the only one of the five open House seats in California that analysts say is likely to flip from one major party to the other in this year's elections, the state's relatively new "top two" primary system is helping to reshape all of them. Contests in districts dominated by one major party, once essentially settled in primaries, could now continue into the fall. With the candidate fields still taking shape, those might include the races to succeed Republicans Howard P. "Buck" McKeon in northeast Los Angeles County and John Campbell in Orange County, for example.

