[1] Incumbent Republican Senator Kelly Ayotte ran for re-election to a second term in office and won the primary by a wide margin.

Hassan was unopposed in the Democratic primary and won the general election by 1,017 votes, representing a winning margin of approximately 0.14%.

To date, this remains the last time that a Democratic candidate for Senate in New Hampshire has failed to win a majority of the vote or lost any county other than Belknap and Coös.

In October 2013, former New Hampshire Republican State Committee Chairman Jack Kimball said: "There is no question in my mind that she will garner a primary challenger".

[177] On September 7, state House speaker Shawn Jasper (who also had endorsed Ayotte) alleged that voter fraud swung the election.

The Washington Post was able to quickly contact three such voters who said that they were college students and kept the driver's license from their home state.