The state's top election official says voter turnout through midday has been relatively brisk.
New Hampshire Public Radio's Josh Rogers has more.
Secretary of State Bill Gardner says indications are that turnout is strong statewide, including in the cities of Concord, Rochester, Manchester and Portsmouth, and in towns like Swanzey, Amherst, Bow and Hooksett.
"In some places, local officials are considering it to be like a presidential election, but the numbers that I've actually got lead me to believe that it's going to be higher than what a lot of people have thought, but I don't think it will be higher than the last midterm."
Last week Gardner predicted 398 thousand people would cast ballots; that's about 48 percent of eligible voters. During the last midterm election, 2002, 453 thousand people voted, the most ever in a non-presidential year.
For NHPR News, I'm Josh Rogers.