Senate battles tighten in two key races

According to new polls, the Senate race in two key states is closing in the last week of mid-term elections.

Polls released Wednesday by Fox News show that margins have narrowed in North Dakota and Arizona, two states that will help determine which party will control the Senate next year.

In North Dakota, Rep. Kevin CramerKevin John CramerEXIM: The fate of the bank is tied to the outcome of the Senate's mid-term debate. Countdown to the elections: the violence casts a cloud before the middle | Clinton opens at 2020 | Trump calls Gillum a "thief" | Dems are worried about the mid-term message | Trump camp mid-term advertising does not present the biggest winner of the elections? Polarization in America MORE (R-N.D.) Lead the Democratic Senator Heidi HeitkampMary (Heidi) Kathryn Heitkamp Countdown to the elections: a week from mid-session | The battlefield of the house is enlarging | Trump double on immigration | GOP campaign leader reprimands Steve King | The Clinton team calm the 2020 speech | Sanders will not promise to sit for the entire term of the Senate Countdown to elections: Violence throws clouds before mid-term | Clinton opens at 2020 | Trump calls Gillum a "thief" | Dems are worried about the mid-term message | Trump camp mid-term advertising does not present the biggest winner of the elections? Polarization in America MORE (N.D.) in single figures between 51% and 42% of potential voters, according to the Fox News poll conducted by Anderson Robbins Research and Shaw & Company Research.

That's a narrower margin than a Fox News poll released Oct. 3, in which Cramer was ahead of Heitkamp by 12 percentage points, between 53% and 41% among likely voters.

The survey ran from October 27 to 30 with live telephone interviews of 789 likely voters and includes an error margin of 3 percentage points.

In Arizona, the latest Fox News poll aims to retire from Sen. Jeff FlakeJeffrey (Jeff) Lane Cononway's husband thinks Trump's birthright proposal is "unconstitutional" Flake: Trump "can not and should not" give up birthright citizenship Poll: Sinema leads McSally's 6 points in the Arizona Senate race PLUS (R-Ariz.) Tied with representatives Kyrsten Sinema (D-Ariz.) And Martha McSallyMartha Elizabeth McSallyPavlich: Arizona Does Not Deserve Sinema's Night Health Care – Presented by Purdue Pharma – Idaho GOP Governor Supports Medicaid Expansion | ObamaCare registration is not expected to increase next year | Pfizer chief expects drug prices to return to normal »House battlefield expands | Trump double on immigration | GOP campaign leader reprimands Steve King | The Clinton team calm the 2020 speech | Sanders will not promise to sit in the Senate for a full term MORE (R-Ariz.) Both to 46 percent among lightweight voters.

It's a slightly tighter run than a Fox News poll released Oct. 3, in which Sinema led McSally between 47% and 45% among likely voters.

The survey was conducted in Arizona from October 27 to 29 with telephone interviews of 643 likely voters and a margin of error of 3.5 percentage points.

As the Senate races in Arizona and North Dakota have narrowed, the race in Missouri between Sen. Claire McCaskillClaire Conner McCaskillElection Countdown: A Mid-Term Week | The battlefield of the house is enlarging | Trump double on immigration | GOP campaign leader reprimands Steve King | The Clinton team calm the 2020 speech | Sanders will not promise to serve the Senate's full-term fixed-term card in the "historically difficult" Senate for Dems, pollster says Countdown to elections: violence casts clouds before mid-term | Clinton opens at 2020 | Trump calls Gillum a "thief" | Dems are worried about the mid-term message | The mid-term advertisement for Trump Camp does not introduce the president. (D-Mo.) And GOP candidate Attorney General Josh Hawley remains unchanged from a Fox News poll on Oct. 3.

McCaskill and Hawley are at a dead end, each receiving 43% of likely voters, according to the poll, with an error margin of 3.5 percentage points.

And in Tennessee, where Sen. Bob CorkerRobert (Bob) CorkerPoll Phillips: Blackburn up five in the Tennessee Senate race Taylor Swift post on Instagram, she voted for Bredesen in Tennessee The Trump administration must continue his investigation into the case Khashoggi PLUS (R-Tenn.) Retires and Indiana, where Democratic Sen. Joe DonnellyJoseph (Joe) Simon Donnelly: Five Conclusions to Be Taken From the Final Debate of the Senate of Indiana The Vulnerable Senate is open to legislation terminating citizenship. Senate map is "historically difficult" for Dems, according to a pollster MORE (D-Ind.) Is in the process of re-election, the Senate elections have expanded in recent weeks, according to new polls Fox News.

representative Marsha BlackburnMarsha BlackburnPoll: Blackburn up 5 in the Tennessee Senate race EXIM Bank's fate is tied to the result of the half-time Senate elections Taylor Swift's posts on Instagram, she voted for Bredesen in Tennessee MORE (R-Tenn.) Leads former governor Phil Bredesen (D) by 9 percentage points, between 50 and 41% among likely voters. That's a wider margin than the 5-point Blackburn had in the same poll released earlier this month.

The survey was conducted between Oc. 27-30, and includes interviews with 718 likely voters. The survey has a margin of error of 3.5 percentage points.

And in Indiana, Donnelly is senior businessman Mike Braun, GOP candidate in the Senate, between 45% and 38% of potential voters, according to the Fox News poll.

The margin is wider than his 2 percentage points in advance that he had in a Fox News poll earlier this month, while he was leading Braun between 43% and 41%.

The survey in Indiana was conducted between October 27 and 30 and included interviews with 722 potential voters. The margin of error is 3.5 percentage points.