After months of political hype based on meaningless national polls, the actual state-by-state process of choosing candidates is about to get underway. In less than a month, it's Iowa, and a week later, New Hampshire. By that time, the political battlefield could be littered with bodies. In the meantime, every Republican and Democratic candidate — from Trump to O'Malley — is already fighting to stay alive. We talk to veteran observers about last-minute changes in strategy, substance — and personnel -- that could turn out to be crucial.