Democratic Sen. Claire McCaskill (right) speaks Sept. 21, 2012, as she looks toward Republican challenger Rep. Todd Akin during the first debate in the Missouri Senate race in Columbia, Mo. (Associated Press)

Photo by: Jeff Roberson

Democratic Sen. Claire McCaskill (right) speaks Sept. 21, 2012, as she looks toward Republican challenger Rep. Todd Akin during the first debate in the Missouri Senate race in Columbia, Mo. (Associated Press)