Arnold Schwarzennegger announced his candidacy for governor on the Tonight Show. John Edwards announced his candidacy for president on The Daily Show. And now Sarah Palin has in effect announced her candidacy for president in 2012 by denouncing Late Show host David Letterman for a joke about her daughter--the wrong, younger daughter, it turned out--being knocked up by baseball star Alex Rodriguez.
Palin accused Letterman of promulgating statutory rape. He apologized for the joke. Neither Rodriguez, who was once Madonna's insignificant...
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