MITT ROMNEY isn’t openly running for president yet, but he’s clearly focused like a laser on 2012. And seldom has a noncandidate done so well by doing so little. That’s mostly because an astonishing number of his putative 2012 rivals have obliged Romney by systematically stumbling. Louisiana Governor Bobby Jindal’s stock sank like a stone after his amateurish, underwhelming response to President Obama’s February address to Congress. Sarah Palin’s decision to resign as governor of Alaska has only exacerbated doubts about her abilities. South Carolina Governor Mark Sanford and Nevada Senator John Ensign have been badly embarrassed by soap opera...