re: Who does Mike Pence think is his constituency?

He knows that he cannot win now and that he has a niche group that supports him. So, I suspect we will see a much more aggressive Pence in the early debates before he drops out. He will likely wait to see if Youngkin gets in race, and how the polls do after a few debates, before making an endorsement. IMO, that would likely be DeSantis or Youngkin, but he'd probably prefer to endorse Haley or maybe even Burgum.