As expected, Mitt Romney, the 2012 GOP nominee for President, is jumping in: https://www.cnn.com/2018/02/16/politics/mitt-romney-senate-utah/index.html
Is he a shoo-in or could this really be a race, either in the Republican primary or in the general?
So the thread is about Mitt Romney but for some reason his name isn’t in the thread title? 
He’s got name recognition and that’s more than enough for a not insignificant percentage of voters, possibly even a majority.
No, it’s about the race generally. He’s just the biggest factor and the best-known name in the race right now.
Since when is Romney a Utahn? I know he’s a Latter-Day Saint, which gives him at least some connection, but has he lived there for any significant time before declaring his candidacy? Most states don’t take kindly to outsiders running in their elections, even if the outsiders do have some ties.
There was a Supreme Court ruling that a state has to accept as an “inhabitant” anyone who has lived there for 30 days before the election. Some states, most notably New York, only require residence on Election Day itself. If you’re an inhabitant of that state, at least 30 years old, and a US citizen for at least 9 years, you’re eligible. Romney has homes in Massachusetts, New Hampshire, Michigan, and California too, not just Utah, so he could run in any of those with minimal trouble.
Barring something truly unexpected this’ll be Romney in a walk, regardless of residency issues.
It’s a little more than name recognition in this case. He’s pretty well-liked in the state.
Looking at the other declared primary candidates, the only one I can see surprising Romney is Larry Meyers, who has apparently been pretty active in the Utah Republican party for quite a while. So he might be more formidable in their caucus style selection method than Romney expects.
Assuming he still has a pulse in November, Romney wins handily.
Has anyone ever been a governor of one state and a Representative or Senator of another?
I feel pretty safe in guessing that no one who was a governor would lower himself to run for congressman in another state.
Sam Houston?
Houston was Governor of both Tennessee and Texas, with President of Texas in between.
Daniel Webster was a Congressman from New Hampshire before he was a Congressman and then Senator from Massachusetts.
Oh, sure, he’s legally allowed to run. I was just questioning what the voters would think of him.
But if he’s been in the state for the past four years, that’s a lot different from just moving in a month before the primaries.
I agree, but I think he might have to actually get out and campaign and spend money. Not quite a “walk” but maybe a light jog. 
It will also be interesting to see if he asks for and gets Trump support.
If I were a Utah Republican running for Senate, I wouldn’t touch Trump with a ten-foot pole.
Doubt it, even without considering the humiliation Trump subjected him to. If Romney needs help, he’s in too much trouble to win, for one thing. For another, Trump’s support just might not be helpful, even in Utah.
I’d prefer someone other than Romney, but I think he’s unlikely to lose.
“Even in Utah”? Utah is the state where the independent took 20% of the vote running as a never-Trumpist.