Trump's floor if there's a credible #NeverTrump third partier

[Mister Mets]

With a credible third party candidate, the floor is really low. It might be unlikely that the floor is reached, but there is some precedent.

In the 2010 Colorado gubernatorial election, the Republican candidate got 11 percent because a former Republican got 36.4 percent. The Democrat ended up getting 51 percent, though.