JOPLIN, MO – MAY 29: (AFP OUT) People listen as President Barack Obama speaks during a memorial service on the campus of Missouri Southern State University during a visit to the community that was devastated a week ago by a tornado on May 29, 2011 in Joplin, Missouri. The tornado, which was packing winds of more than 200 mph, is now considered to hold the record for the highest death toll in U.S. history. (Photo by Joe Raedle/Getty Images)