U.S. President Barack Obama tosses a bag of popcorn to members of the media in LeClaire, Iowa, August 16, 2011. Obama is on a three-day mid-west bus tour through Minnesota, Iowa and Illinois, aiming to leave behind doubts about his leadership that could dent his 2012 re-election prospects. REUTERS/Jason Reed (UNITED STATES - Tags: POLITICS ELECTIONS IMAGES OF THE DAY)