A fourth of California's 53 congressional seats could be competitive in this year's elections, thanks to extensive district boundary changes by the state's independent redistricting commission, says a new analysis by the Cook Political Report.
The Cook report is considered to be an objective analysis of national political trends and its list of California districts that loom as potentially competitive is contained in a nationwide rundown.
Many of the 13 California districts on the list are either held by incumbents or have incumbents running after changing addresses, while others are open seats without incumbents.
The incumbent seats are those held by Democrats Jim Costa, Lois Capps, John Garamendi and Jerry McNerney and Republicans Dan Lungren, Gary Miller, Brian Bilbray, Jeff Denham and Mary Bono.
The most threatened incumbents are in the "tossup" districts and Cook sees them as Republicans Lungren, Miller and Bilbray. Others are in districts that are more likely to go to one party or the other.