She is the most vulnerable Senate Democrat running for reelection in November, if not the most vulnerable senator on the ballot in 2018. Her race, in a state President Trump won by 36 points, is ground zero for the argument that the drama surrounding Brett M. Kavanaugh’s nomination to the Supreme Court may actually help Republicans keep control of the Senate. And yet, Sen. Heitkamp (D-N.D.) is voting against Kavanaugh for the Supreme Court, a decision that thins the margin of error Republicans have to confirm Kavanaugh. That’s despite one local poll taken after Kavanaugh was accused of sexual assault showing 60 percent North Dakota voters want Kavanaugh confirmed.