I want to clear some things up about the New Hampshire primary. In New Hampshire, there are 44% who are Democrats or lean Democrat, 35% who are Republicans or lean Republican, and 20% who report no lean. The latter group would represent the true Independents, if there be such a thing. The state has Republican state officials and Democrat federal representatives, which I suppose makes it officially purple. But on the federal level it is blue. Except for the year 2000, New Hampshire has voted for the Democrat in every presidential election since 1992.
But the voter registration rolls are a bit different. Because New Hampshire has long had an important position in the primaries, many people who are not Independents nevertheless register as “undeclared” (there is no other way to register as an Independent in NH). This gives them the freedom to vote in either the Democrat or Republican primaries. All they have to do, as an undeclared voter, is to ask for either ballot when they enter the polling venue. They can’t vote in both, of course. But they can vote in either.
This means that there is great incentive for people to register as “undeclared.” Voting in one primary or other changes their affiliation to that party, but they can change it right back that very day before they exit the place. That’s how it works, and so it was tailor-made for people on the left to vote for Nikki Haley if they wished to do so. But that’s not just a phenomenon this year; it happens in other years, in particular when the other party has an incumbent and therefore a non-competitive race. If both races are competitive, it’s less likely to feature crossover undeclared votes for the simple reason that there is far more motivation to vote in the primary of the party one wants to vote for in the general.
As far as registration numbers go, 30.28% of the voters are registered Democrats, 29.82% are registered Republicans, and 39.90% are unaffiliated (also sometimes called undeclared at other sites). Therefore I think we can safely say that at least half of the undeclared voters actually lean to one party or other, and more of them are Democrats. The people who are registered as being members of a certain party are also able to change their affiliation, with a deadline a few months prior to the primaries.
All of this is relevant to the statistic I’ve read, which is that 70% of Haley’s votes were not registered Republicans. This is made easier by the NH system of primary voting. I don’t know how it compares to other “moderate” candidates in previous years, though, because I’ve never read statistics on it, but a quick search located this:
In 2000, 62 percent of undeclared voters chose the Republican ballot — and 61 percent of that group voted for John McCain, helping him defeat George W. Bush in the New Hampshire primary. But in the 2008 primary, when Hillary Clinton and Barack Obama faced off on the Democratic side, the group flipped, with 62 percent taking the Democratic ballot. Mrs. Clinton emerged as the winner.
This year [2016], undeclared voters are finding their decision especially daunting.
“I am truly, completely undecided,” said Barbara Wilson, 64, of Henniker, who said she liked both Democratic candidates, as well as Senator Marco Rubio of Florida. “I have no earthly idea what I’m going to do at the end of the day.” …
Then there is strategy to consider, with some undecided voters debating not just which candidates they like best, but also which primary would allow their votes to have a greater impact. The Democratic primary has been fairly static, with Mr. Sanders holding a sizable lead over Mrs. Clinton. But the Republican race feels up for grabs.
So you can see that this is an old story in New Hampshire.