Over the last three months, the GOP's Iowa front-runner has become an incredible, shrinking presence on the campaign trail. Sure, he's still touring the country, introducing himself to voters, telling them how unafraid he was to stand up to the unions and liberal protesters he battled in Wisconsin, but he's also ducking out of uncontrolled situations, skipping questions from the press, and spending more time on small or private events, usually packed with friendly crowds.