"Those voters, moreover, have over time “self-sorted” themselves into highly partisan districts: loony left in Berkeley or Santa Monica, for instance; rabid right in Orange County or parts of the Central Valley. Politicians have done the rest by gerrymandering bizarre boundaries around their supporters. The result is that elections are won during the Republican or Democratic primaries, rather than in run-offs between the two parties. This makes for a state legislature full of mad-eyed extremists in a state that otherwise has surprising numbers of reasonable citizens."