David Letterman may be one of the best known late night comedians to fearlessly take on Sarah Palin jokes night after night — and luckily for Dave, right now comedic business is booming in the Palin joke department. The news that Bristol Palin is engaged to Levi Johnston found Dave as pleased s a kid in a candy shop last night — as it did for late night comics on other networks. OK! GALLERY: EVENT TO PREVENT BRINGS BRISTOL PALIN TO THE BIG APPLE In his opening monologue last night, Dave made a number of quips about the renewed union between the couple — who already have young ... Read More >>