A Mudflats reader went to work:

On a hunch, I reviewed online lists of all the men and women who’ve been elected governor of their state since the year 1900. Pored over them for a few hours. Over 1200 politicians have taken that first-term oath of office. Some soon died in office. Many resigned to accept other positions in government, including Spiro Agnew who was “tapped” by Nixon after being the Governor of Maryland for about five minutes. On a handful of occasions, a first-termer was dragged off to the slammer or impeached. One was incapacitated by a nervous breakdown and one left just as impeachment came knocking on his door. Sohow many out of over 1200 just up and quit before the end of their term?

Three: Jim McGreevy, Eliot Spitzer and Sarah Palin.