Matheson's pretty comfortable in his House seat. He'd be foolish to give it up for a longshot at taking down Herbert. Trailing by 10% this far out isn't horrible...for a little-known challenger. Thing is, Matheson is already pretty well-known, so making up that deficit would be quite a challenge for him.
Agreed. While he is probably the only Democrat that could get low 40s I doubt he could actually win in a 2 person race.
And it's not like he'd be able to actually DO much as governor. Utah Republicans gerrymandered their seats well enough to hold like 75% in both houses, so they could easily override his veto if they wanted to.