An exclusive statewide poll by Valley News Live and Mason-Dixon Polling shows, that not even a week after North Dakota's primary, the race for the U.S. Senate is tightening. The statewide poll shows Kevin Cramer only holds a 4% lead over incumbent Heidi Heitkamp...that's within the poll's margin of error. Valley News Live commissioned the poll through Mason-Dixon Polling. 625 voters in North Dakota were interviewed by phone for the poll.

When you look at the overall state, the Senate race shows Kevin Cramer with 48%, Heidi Heitkamp with 44% and 8% were undecided.

In Eastern North Dakota, you'll notice that Cramer's support starts to drop. He has 44%, Heitkamp at 47% with 9% undecided.

The numbers really show support for the incumbent Heitkamp, when you look closer at just Fargo and Cass County. Heitcamp with 54%, Cramer at just 35% and 11% undecided.

In Bismarck-Mandan, Cramer rebounds with 56%, Heitkamp 37% with 7% undecided.

Western North Dakota mirrors the support for Kevin Cramer. He's at 57%, Heitkamp 38% with 10% undecided.

The poll was conducted just last week from June 13th though the 15th. Tomorrow (Tuesday), we will unveil how the race is shaping up for the U.S. House Race between Democrat Mac Schneider and Republican Kelly Armstrong. Also, though-out the week, we will be posting numbers on key statewide races.