WASHINGTON — Unanticipated events in politics — say, for example, Sarah Palin’s announcement that she was quitting as governor of Alaska — tend to be overanalyzed, imbued with more motive, forethought and political calculus than might really be there... _________________________________________ Some people suggested there was a shrewdness to her gambit. From this view, the announcement, as precipitous as it might have appeared, was part of a considered grand plan of rehabilitation and preparation that would position her as the strongest possible challenger to President Obama in 2012... ______________________________________________ Perhaps. But there is plenty of evidence that argues against the idea...