Republican Rep. Kevin Cramer has a double digit lead over Democratic Sen. Heidi Heitkamp (pictured) in the North Dakota poll, with 53 percent of likely voters picking the Republican and 41 percent supporting the Democrat. | Mark Wilson/Getty Images Elections Senate polls: GOP leads in North Dakota, 4 other races close

New Fox News polls of five battleground Senate races show three key states too close to call, while North Dakota has trended sharply in favor of Republicans and the GOP has opened a narrow edge in Tennessee.

Republican Rep. Kevin Cramer has a double digit lead over Democratic Sen. Heidi Heitkamp in the North Dakota poll, with 53 percent of likely voters picking the Republican and 41 percent supporting the Democrat. Last month, Cramer led Heitkamp by 4 points in a survey of the race.


In the Tennessee poll, Republican Rep. Marsha Blackburn leads former Democratic Gov. Phil Bredesen 48 percent to 43 percent. In September, Blackburn led Bredesen by 3 percentage points.

But in another state held by a retiring Republican senator, Democrats have a slim advantage: The poll of Arizona showed Democratic Rep. Kyrsten Sinema with 47 percent to 45 percent for GOP Rep. Martha McSally. It’s virtually identical to last month’s poll, which showed Sinema up 3 points.

In Indiana, Democratic Sen. Joe Donnelly had the same narrow edge over Republican Mike Braun, 43 percent to 41 percent among likely voters, with Libertarian candidate Lucy Brenton getting 6 percent of the vote and 8 percent saying they were undecided. Braun held a slight lead over Donnelly in last month’s poll.

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In Missouri, Democratic Sen. Claire McCaskill and Republican Attorney General Josh Hawley are tied at 43 percent among likely voters, with 8 percent preferring another candidate. In a hypothetical two-way matchup, McCaskill and Hawley are tied at 46 percent among likely voters. McCaskill had a slight lead over Hawley in September.

The polls were conducted from Sept. 29 to Oct. 2. In Arizona, Fox News interviewed 716 likely voters; in Indiana, they interviewed 695 likely voters; in Missouri, they interviewed 683 likely voters; in North Dakota, they interviewed 704 likely voters; and in Tennessee, they interviewed 666 likely voters. All five polls had a margin of error of plus or minus 3.5 percentage points.