Clinton won the state with 47.62% of the vote, while Trump lost with 47.25%, or by a 0.4% margin. This marked the second-closest margin percentage, only behind Michigan. As of 2020, this is the last election when a Republican won Carroll, Hillsborough, Rockingham, and Sullivan Counties.
As per tradition and by New Hampshire electoral laws, New Hampshire holds the primaries before any other state. As a result, candidates for nomination usually spend a long period campaigning in New Hampshire.
Former Secretary of State Hillary Clinton at a campaign event in Manchester
Senator Bernie Sanders at a campaign event in Hooksett
In the New Hampshire Democratic primary taking place on February 9, 2016, there were 24 pledged delegates and 8 super delegates that went to the Democratic National Convention. The pledged electors were allocated in this way. 16 delegates were allocated proportionally by congressional district (8 delegates per district). The other 8 delegates were allocated based on the statewide popular vote.
The New Hampshire Republican primary took place on February 9, 2016, where there were 23 bound delegates which were allocated proportionally and a candidate has to get at least 10% of the vote to get any delegates to the Republican National Convention.
Up until late October 2016, Democrat Hillary Clinton won almost every pre-election poll. On November 1, just one week before the election, Republican Donald Trump won a poll for the first time, 44% to 42%. In the final week, Trump won 4 polls to Clinton's 2 and one tie. The final poll showed a 45% to 44% lead for Clinton, which was accurate compared to the results. The average of the final 3 polls showed Clinton up 45% to 42%.
Hillary Clinton's margin of victory was the smallest for a Democrat in the state since Woodrow Wilson narrowly won it in 1916. New Hampshire last voted for a Republican, George W. Bush, in 2000, and although Trump did not win New Hampshire, the top-line county results were exactly the same in 2000 and 2016. Despite Trump's narrow loss, this would be the first presidential election since 2000 where New Hampshire would vote more Republican than the national average, when the Republican candidate won more of the state's counties, along with the first time since 1976 when the winner of Coos County did not also carry the state as well. Coincidentally, New Hampshire voted as Republican in 2016 as it did Democratic in 2012 in comparison to the rest of the nation.
On September 7, 2017, state House speaker Shawn Jasper announced that data showed that 6,540 people voted using out-of-state licenses. Of those, only 15% had received state licenses by August 2017. Of the remaining 5,526, only 3.3% had registered a motor vehicle in New Hampshire. In addition to the close vote for president, Democratic Governor Maggie Hassan defeated incumbent Republican Senator Kelly Ayotte by 1,017 votes. In February 2017, President Trump had told a gathering of senators at the White House that fraudulent out-of-state voting had cost him and Ayotte the election in New Hampshire. Mainstream media disputed Trump's and Japser's assertion. New Hampshire law permits New Hampshire residents to vote using out-of-state identification if they are domiciled in the state, out-of-state college students attending schools in New Hampshire being one example of such legitimate use of out-of-state identification.
Several investigations by New Hampshire's Ballot Law Commission found no evidence of widespread fraud, and only 4 instances of fraud total in the state for the 2016 elections. Specifically addressing the claim of people being bussed in from out of state to vote, Associate Attorney General Anne Edwards noted that they found no evidence for such claims. When they investigated these claims, they found that the buses were chartered out of state, but the voters on the buses lived in New Hampshire and could legally vote there.