Sen. Dianne Feinstein (D-Calif.) is backing L.A. City Councilwoman Janice Hahn's campaign for Rep. Jane Harman's (D-Calif.) soon to be open congressional seat. 

Harman will vacate her seat to become the new head of the Woodrow Wilson Center for International Scholars, a Washington think tank, paving the way for a special election.   

Los Angeles Mayor Antonio Villarigosa and California's state Assembly Speaker have already announced their support of Hahn for the Democratic nomination, but she may still face a primary. California Secretary of State Debra Bowen and Democrat Marcy Winograd, who challenged Harman in a primary last cycle, are also weighing runs for the seat. 

Republicans, meanwhile, are cautiously eyeing the district, with some candidates already weighing bids. The largely Democratic district was held for one term in the late 90s by centrist Republican Steve Kuykendall.