California politicians used to joke that the state's U.S. House delegation had less turnover than the Soviet Politburo. It's funny because it's true. Only once in 265 races from 2002 to 2010 did a district's representation flip parties. Incumbents held onto all but one seat they vied for in a general election. That's because like most politicians around the country, they controlled the maps laying out the boundaries of their districts.
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