A strain of anti-incumbent fever swept through the electorate Nov. 3 as cranky voters replaced two Democratic governors with Republicans and elected a Democrat to an upstate New York House seat that the GOP has long controlled. Maine voters rejected a law allowing gay marriage. Republicans sought to frame wins in Virginia and New Jersey as rejections of President Obama and a grim omen for his party in next year's congressional battles. But with economic angst and regional concerns dominant in most races, politics this year appeared primarily local.
In a coup for the GOP, former federal prosecutor...