Obama On Letterman: 'Palin Would Be The Lipstick' Presidential Hopeful Says Media Took His Words And Ran; Defends Bush Policies On Afghanistan, AIDS In Africa NEW YORK (CBS) ― Presidential hopeful Barack Obama appeared on the "Late Show with David Letterman" in New York on Wednesday after a day of heated debate by media and political pundits over comments some took as a slam against Republican vice-presidential candidate Sarah Palin. Obama spent much of his visit talking about Palin and clarifying his earlier comments. "This is sort of silly season in politics, not that there's a non-silly season, but it...