I got no prob with him wiping his hand if haiti dude's hand was dirty, but on the shirt of the guy next to him, also a formerr Pres? that is some low class shit.
Bush did a similar thing when he was on the Letterman show. during commercial break he used the shirt of Letterman's director to wipe off his glasses.
http://www.youtube.com/watch?v=bUVYcWxvqaM