Well, you see, the leader of the popular vote for the Republicans in 2016 was...
The leader of the party doesn't define the identity of all the members.
I get it, the bozos on stage are the enemy. But not everyone that identifies as Democrat are as far off the end as the leaders. I certainly don't want to identify with Trump, yet he's my party's choice.
And I wonder if there's a time coming (maybe soon) where the two parties split so far apart that another party springs up to grab the growing "enlightened centrist" who just can't stand the extremism and constant partisan politics. We've gotten to the point where a centrist/moderate who's a viable candidate (e.g. Tulsi, Kasich) in the general election just can't get past the primaries.
I saw a poll fairly recently that showed the middle is shrinking. People are joining the fringes.