Berg has been consistently trying to tie Heitkamp to President Obama. He got some help from the Crossroads GPS ad: The spot quoted Heitkamp in 2008 saying, "I think Barack Obama's going to be amazing and I think we are on our way to a better United States," and the ad's narrator says Heitkamp "supports Obamacare."
Indeed, Obama lost North Dakota by nine points in 2008, and he is in significantly worse shape in the state this year. The DFM Research poll shows former Massachusetts Gov. Mitt Romney 19 percentage points ahead of Obama, 51 percent to 32 percent.
Successfully tying Heitkamp to the national Democratic Party could also have a positive effect for Berg: Just 34 percent of likely voters have a favorable opinion of the party, compared to 52 percent who view the GOP favorably.
The poll was conducted April 18-26, surveying 478 likely voters. The margin of error is plus-or-minus 4.5 percentage points.