**FILE** Candidate for the U.S. Senate from Oklahoma, Dr. Tom Coburn, at the University of Central Oklahoma in Edmond, Okla., in this file photo from Oct 4, 2004. Coburn called for Attorney General Alberto Gonzales to resign during Gonzales' Senate testimony Thursday April 19, 2007. "The best way to put this behind us is your resignation," Coburn bluntly told Gonzales. (AP Photo-File)