After last week's Iowa caucuses, some television commentators were surprisingly caught off-guard by Mitt Romney's hairs-breadth victory over Rick Santorum. But why the shock? Watching Santorum on the Sunday-morning circuit two weeks ago, I saw him point out that he was the only candidate who hadn't yet had a chance to run the gauntlet. Romney had held steady with 25% of the vote for six months or so, with Bachmann, Perry, Cain, and Gingrich all taking turns as the lead contender. Iowa came, and Santorum was up. And why not?