Compare the 2012 election results in the first state in which Trump won more primary votes than Clinton.
Unlike with more typical states, the number of Trump votes per county is slightly positively correlated with the two-candidate Trump vote percentage per county, and the number of Clinton votes per county is only slightly negatively correlated with the two-candidate Trump vote percentage per county. This is very rare, as in most states, the rural counties are more Republican, while the urban counties are Democratic sinks which, nevertheless, have comparable or a larger number of Republican votes than rural counties. Not so for NH, where the two most populous counties are not significantly more Democratic than the rural counties! I think New Hampshire is the only state with this pattern.
Trump got slightly more votes in the New Hampshire presidential primary than Clinton; 51.3% of the two-candidate vote. That’s nearly 5 points better than Mitt.