Whither Santorum and Those 'Guns and Bible' Voters?

After his stunning surge in Iowa, Rick Santorum's virtual tie for fourth place in New Hampshire is being interpreted negatively by some commentators and pundits who are gleefully declaring that the social conservative and evangelical voters -- those "guns and Bible" folks -- have run out of steam. They are also claiming that Santorum, Gingrich, and Perry are splitting the evangelical vote, making it likely that Romney will coast to a win in South Carolina as well.