President Obama 's visit first time a sitting president has been `` Letterman '' guest . Obama says he 'll ask `` tough questions '' before sending more troops to Afghanistan . President says he does n't think racism fuels opposition to health care overhaul . What did daughters Malia and Sasha do this summer ? `` Late Show With David Letterman . '' TL;DR Video on msnbc.com
President Obama 's visit first time a sitting president has been `` Letterman '' guest . Obama says he 'll ask `` tough questions '' before sending more troops to Afghanistan . President says he does n't think racism fuels opposition to health care overhaul . What did daughters Malia and Sasha do this summer ? TL;DR Video on msnbc.com