Only six votes truly matter in the fight over gun control. Five are vulnerable Senate Democrats from deeply red states. The five senators (with Obama 2012 vote percentages) are Mark Begich of Alaska (40.8 percent), Max Baucus of Montana (41.7 percent), Tim Johnson of South Dakota (39.9 percent), Mark Pryor of Arkansas (36.9 percent) and Mary Landrieu of Louisiana (40.6 percent).

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