Romney's new ad:
Mitt's support has ticked up, buoyed by the unlikely duo of David Frum and Matt Drudge. But he's still vulnerable:
Romney may be emerging as a front-runner in a GOP race that has been characterized to date by its lack of a leading candidate. Republican nomination contests usually have a clear front-runner, and that candidate often goes on to win. But that did not hold true in the last presidential election cycle, when Rudy Giuliani led in national preference polls throughout 2007 but performed poorly in the actual nominating contests in 2008. Additionally, even if Romney were to expand his lead into the double digits in the coming months, he still would rate as one of the weakest Republican front-runners in recent GOP nominating history.