Chris Mitchum, son of actor Robert Mitchum, is challenging Rep. Lois Capps, a Democrat, and Abel Maldonado, the former Republican lieutenant governor, in a Central Coast district that's been redrawn to include more GOP voters.SANTA BARBARA — The last time Chris Mitchum won an election was when he ran for the board of the Screen Actors Guild, vowing to wrest the union from the grip of leftists.