"Everybody agreed that Galba would make an excellent emperor, until he became emperor." Substitute "became emperor" with "formed an exploratory committee to run for president," and you have Mitch Daniels circa fall 2011.
In a so far weak Republican field of presidential possibilities Palin stands out as the top dog. Other serious GOP candidates better start taking her seriously and get in the game quickly before she has a lead that can't be beaten.
While it's hard enough to predict tomorrow's weather or the 2010 midterms, here's an objective morning line on the 2012 presidential race based on three criteria and three variables. Why should Nate Silver have all the fun?