Someone else said this somewhere on this forum (I forget who), but if Sununu stops governing exclusively from the right, that's a sign that he'll run. It was the same with Rick Scott in Florida.
That was me. Sununu is very calculating in his political approaches, and his grand flip-flop on Planned Parenthood sent out a huge signal in 2016 that he'd run. It was a massive shock to see him even vote to fund it, considering he voted against funding in 2012/2014.
Shaheen is most likely going win again, even if Trump flipped New Hampshire she would still win. Shaheen is a more established Senator than Hassan, and would beat Kelly Ayotte, Frank Guinta, or any Republican thrown at her, by at least 4-5%.
Governor Sununu could beat Shaheen, but as he has already declined to run, I don't see the point to looking at polls pertaining to a potential senate campaign from him next year.
Many times, politicians decline and look back at the race later, for example, early on, Joe Biden repeatedly declined that he had interest in the race.
Again, if he runs, I think he'll wait until 2022 or 2026, depending on whether Trump gets re-elected or not. If there's a Democratic president and midterm turnout trends continue, it'll be at least Lean R if he gets in.
