Why would you tie yourself to a lame duck?

I don't generally write much about politics anymore, because there isn't anything to say that hasn't already been said by someone else, probably in a more eloquent way. But I keep seeing ads here locally that I find totally baffling. I still can't believe that Trump ever got elected, let alone twice. He's just such a dick to people, and totally out of touch with everything. He doesn't understand…