How Trump and trade factor into Heitkamp's reelection battle

North Dakota is small in terms of population, but its Senate race this fall is attracting major attention. Incumbent Heidi Heitkamp, the only high-level Democratic official left in the state, faces a close contest with Republican Rep. Kevin Cramer, an enthusiastic supporter of President Trump. For the state's farmers, the choice may amount to a referendum on the president's trade war with China.