Incumbent Shaheen campaigned hard to keep her seat in a very close race against Republican Scott Brown, a former U.S. senator from Massachusetts who moved to New Hampshire after losing the 2012 election to Democrat Elizabeth Warren. Polling throughout the campaign showed Shaheen and Brown in lock-step, with a very narrow margin of favorability.
Shaheen was elected to the Senate in 2008 when she defeated Republican John Sununu.
Once a solidly Republican state, New Hampshire became a swing state with a Democratic tilt. The Republican party has since been eager to reclaim the Senate seat.
An endorsement from Cosmopolitan magazine brought levity to the tight race in September when Cosmo announced that it was endorsing Shaheen over Brown, who posed nude for the magazine at age 22 and was dubbed "sexiest man" in 1982. The magazine explained it was picking "brains over brawn."