Tea Party Powers an Upset Win by O'Donnell in Delaware

How will Republican insurgents fare against Democrats?

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This year's primaries have knocked out three Senators—Republicans Bob Bennett of Utah and Alaska's Lisa Murkowski and Republican-turned-Democrat Arlen Specter of Pennsylvania—and five House members, Castle, Democrat-turned-Republican Parker Griffith of Alabama, Democrats Carolyn Cheeks Kilpatrick of Michigan, Alan Mollohan of West Virginia, and Republican Bob Inglis of South Carolina.

While these races captured the headlines, a majority of voters stuck with most incumbents. In total, 23 Senators and 393 House members ran in this primary season.

  • See a slide show of incumbents ousted in primary season.
  • Follow the money in Congress.
  • Check out a roundup of political cartoons on the 2010 elections.