Make of it what you will (he's one State Rep, albeit the Majority Floor leader) but seems like Joe Sweeney has endorsed (or is at least supporting) Chuck Morse pretty openly.
https://twitter.com/JoeSweeneyNH/status/1777746441085050967Really not a surprise; both are from Salem and I'm pretty sure they have been close for quite a while.
More significant maybe is that a lot of his former Senate colleagues are backing him. At the very least Sharon Carson, the Senate Majority Leader, endorsed him at a press conference on his (pretty stupid makes Kelly Ayotte look normal on the border) "Fortifying the Granite State Defense Plan." A few other State Senators were present as well but they are listed as "attending in support of the plan," and only Sweeney and Carson have direct quotes in the press statement saying they support Morse.
On a general note, it's basically just living proof of how national and reflexive GOP politics are at this point given that Morse and Ayotte are getting into a fight about immigration, as though either of them will be able to deal with that as Governor in any meaningful way. Morse has an "Amnesty Ayotte" website now and is (again, as expected) tacking to her right. I mean the whole thing is nonsense, this is not an issue that will win the general, but Morse knows he needs some hook, and Ayotte cannot afford to just ignore it. It does seem Morse being so negative is creating some friction, but among voters who knows. He's at least remaining relevant and is shaping Ayotte's campaign, and it does mean it may be somewhat closer than it looked at first.