10/11/2008 05:12 am ET Updated May 25, 2011

Obama Appears On Letterman, Discusses Palin "Phenomenon," Lipstick Remark (VIDEO)

Barack Obama appeared on the "Late Show with David Letterman" Wednesday night for an extended chat with the CBS host. In the opening part of the interview Obama discussed the phenomenon of Sarah Palin and further clarified what he meant by his "lipstick" comment.

Watch the clip: