From the first day of 2011, Mitt Romney was the favorite to win the 2012 Republican presidential primary campaign. No one else was even close. The 2016 outlook could not be more different. Offered the choice to bet on one single candidate to win the nomination versus the rest of the field, the choice would have to be "the field." For the first time in years, there is no one next in line. And without a former vice president or powerhouse former candidate looking likely to run, Republicans are shaping up to spend the next year and a half fighting...