If the last poll before Election Day is any indication, it will be a long night once the polls close.

The Granite State Poll, conducted by the University of New Hampshire Survey Center, shows both the First Congressional Race and the U.S. Senate races as too close to call.

The polls open Tuesday morning at 7 a.m. and close at 8 p.m.. Secretary of State David Scanlan expects a turnout of 591,000, just over half the registered voters in New Hampshire.

Democrat Rep. Chris Pappas leads Republican challenger Karoline Leavitt 50%-49%, with 1% undecided. Leavitt closed a 7% gap between them since September.

Incumbent Sen. Maggie Hassan and Republican Don Bolduc are in a statistical tie, 50%-48%. 1% would vote for Libertarian Jeremy Kauffman, less than 1% would vote for another candidate, and less than 1% are undecided. 99% of Democrats said they would vote for Hassan while 94% of Republicans back Bolduc.

Gov. Chris Sununu continues his double-digit domination of Democratic state Sen. Dr. Tom Sherman 55%-43%.

The UNH poll is a reflection of how close the Senate and CD 1 races are heading into Election Day, according to SNHU Civic Scholar and founder of NH Political Capital Dean Spiliotes, making it a tough race to call.

"The Secretary of State is predicting a record midterm turnout, which makes these races difficult to predict. We will need to see if independents break in a unified way toward one party or the other. That would be the difference in these close races."

Contact reporter Dan Alexander at Dan.Alexander@townsquaremedia.com or via Twitter @DanAlexanderNH

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