Dems hope to possibly make Pombo's seat in CA competitive in '06. They are hoping that state senator Mike Machado will run against him. Machado won re-election to the state senate in '04 by beating Stockton mayor Gary Podesto in a heated race. Pombo is not well liked by many in his district for some of his stances on environmental issues.
If Machado loses against Pombo, the Dems will still have him in the state senate, and a competitive race could mean trouble for Pombo in '08 if he survives '06.
Sounds like we're doing the same thing in PA with Tim Murphy's seat using State Sen. Sean Logan.