**FILE** Democratic U.S. Senate candidate Heidi Heitkamp (left) listens to Republican opponent Rick Berg speak at a North Dakota Chamber of Commerce forum on health care and energy at a hotel in Bismarck, N.D., on Oct. 11, 2012. (Associated Press)

Photo by: Dale Wetzel

**FILE** Democratic U.S. Senate candidate Heidi Heitkamp (left) listens to Republican opponent Rick Berg speak at a North Dakota Chamber of Commerce forum on health care and energy at a hotel in Bismarck, N.D., on Oct. 11, 2012. (Associated Press)