Before the Bill Clinton years, California was widely regarded as a red state — from San Diego and Orange County to Bakersfield to Glendale and Burbank. These days, California is a Democratic stronghold; the state hasn't gone Republican in a presidential election since George H.W. Bush in 1988. Some of California's rural counties still lean Republican, but in deep red Modoc County, redistricting is fueling a major political upheaval. And incumben…