For a long time I've conceptualized Trump voters as falling into two camps: the enthusiastic and the reluctant. No doubt there are some who fall in between, too, but I think that mainly there are those two categories.
The first group consists of people who supported Trump in the primaries, either as first or second choice. They believe he would be a good president, or at least that he was the very best or one of the very best of the lot of GOP candidates who originally threw their hats into the ring.
The second group is composed of people who support Trump now only because he's running against a person they consider worse, Hillary Clinton. They don't always agree on why he would be better than she, but they agree that he probably would. Some of them even detest him otherwise and think that he would make a bad president, but are still willing to vote for him as the alternative to Hillary.
Members of the first group sometimes appeal to members of the second group, urging them to make sure they vote for Trump. Their arguments can vary widely. Sometimes the argument is that Trump will be a good president and will do a number of good things for the country. Sometimes it's that Trump will do
one or two good things, usually involving SCOTUS justice choices and/or immigration policy. And sometimes it's that even though we don't know what Trump might do, we
know that Hillary would be awful and there's at least a
chance that Trump would be better.