It has gone Democrat every election from 2004 on, but the margins in 2004 and 2016 were very slim--Hillary probably won by fraud (her margin was less than 3,000 votes).
2016 was a murder suicide
Hillary won by 0.3 percent of the vote, 47.6 to 47.3, with Gary Johnson getting 4.1.
Hassan won by 0.2 percent of the vote, 48.0 to 47.8, with a right-of-center independent and the libertarian getting 4.1.
If Kelly Ayotte had simply gritted her teeth, and not dis-endorsed Trump, Trump would have won, and so would she (as few of Trump’s supporters would have defected to the minor candidates).
We’ll see what Ayotte does this time around.
As Benjamin Franklin said, we hang together, or we will hang separately.