With just days remaining in a tight race that could determine control of the U.S. Senate, North Dakota Democrat Heidi Heitkamp was seeking a final shot in the arm. Lucky for her, the party’s top campaigner had time to spare and energized a crowd of 3,000 Monday in Fargo. For candidates like Heitkamp, who is running for an open seat in a red state, having national Democrats campaign for her can be a liability. President Obama is expected to lose North Dakota on Election Day, and both he and Senate Majority Leader Harry Reid are albatrosses around Heitkamp’s neck. But in...

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