A new SurveyUSA poll finds Michele Bachmann leading by single digits among likely voters against political novice and hotelier Jim Graves, 50 to 41 percent. Should Bachmann prevail by a similar margin on Election Day, it will continue a tradition for the three-term U.S. Representative. In 2008, Bachmann had the narrowest victory margin among successful Republican U.S. House incumbents at 3.0 points over DFLer Elwyn Tinklenberg. In 2010, her 12.7-point victory over Tarryl Clark gave her the sixth narrowest margin among victorious Republican incumbents. That margin was 29.1 points lower than the 41.8-point nationwide average for incumbent GOP winners for the cycle.