I wouldn't be surprised if more than a few switched their registration to vote for Trump.  Not because they think he can win, but because they want the Democratic nominee to face the weakest possible candidate. I believe this is exactly how Amy Demboski made it to the runoff in the last mayoral election.  Amy's support surged in the week prior to the election.  Many attributed it to her well reported armed confrontation (she didn't brandish, don't freak out) of a sign vandal.  I don't think so - with polling showing Ethan would easily be in the top two, many D's calculated that Demboski was the preferred candidate because a large number of Republicans wouldn't support her in a runoff.  In political circles this is referred to as Rat****ing.  The only difference is that D's and Independents didn't have to change party affiliation to vote in the municipal election.

I personally thought that Coffey or Halcro would make fine mayors, but they didn't pass the CPT (Conservative Purity Test).