In another stunning bit of political news, Sarah Palin announced today that she would resign as governor at the end of the month. We’ll obviously learn more in the coming days and weeks about what prompted this move, but I don’t see how anybody can argue that this bodes well for her presidential ambitions. At the end of last year’s campaign, the general view was that for her to reemerge as a serious presidential candidate, she would have to go back to Alaska, read up on issues, and build up a record of governing accomplishments. It simply makes no sense that she would resign from office after less than 3 years if she were serious about seeking the presidency in 2012. First Huntsman, then Ensign, then Sanford, and now Palin — the 2012 GOP field keeps on getting thiner and thiner. Will anybody be there to stand in Mitt Romney’s way?