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Jim Costa, California’s 16th District In California, candidates of all parties run on the same primary ballot and the two top vote-getters go on to the general election.
Heading into Election Day, Republicans once again occupy all 10 spots of Roll Call’s list of most vulnerable House incumbents, but for the first time this cycle, Iowa Rep.
Martha McSally: McSally narrowly won her first election in 2014, but the former Air Force pilot won re-election last fall by 14 points.