It could actually be that Sarah Palin believes this move is politically sagacious. In my mind, it is completely absurd for her to think leaving the governorship after just 2 1/2 years in any way increases her odds of being elected president. Why would the voters promote someone who quit the last job they hired them for?
.... It has been noted that Ross Perot's decision to drop out of the 1992 presidential race is what did him in when he returned to the race. In my estimation, this decision is similar.
[Hat tip: The Hill Blog Briefing Room]