Democratic U.S. Senate candidate Heidi Heitkamp, left, listens to Republican opponent Rick Berg, right, speak at a North Dakota Chamber of Commerce forum on health care and energy at a hotel in Bismarck, N.D., on Thursday, Oct. 11, 2012. A recent poll put the two candidates in a dead heat three weeks before the election. A Berg victory is crucial to Republican hopes of gaining control of the U.S. Senate. (AP Photo/Dale Wetzel)
