Mitt Romney's confidence is brimming. The former governor, now widely seen as the favorite to win Iowa, announced Wednesday he'll stay in the Hawkeye State the night of the caucus, a clear indication he anticipates a good result. If he does capture Iowa, he'll head into New Hampshire, long his political stronghold, with a chance to become the first non-incumbent GOP presidential candidate ever to win the first two primary contests - a back-to-back triumph that would all but secure the nomination. So, naturally, his Republican rivals have spent the last week castigating him on the trail and eviscerating him...