So who cares? A lot of people apparently care.
But why? Does it actually matter? If it doesn't put opposition butts into seats, then how popular he is has no value. BFD.
Congress has the opposite problem. They're less popular than roaches, but nobody managed to make that worth much, either. (Pity this isn't a bigger FD.)
If there's going to be a third party, let's see how one works at the state and local government levels. If they can't hack it there, they probably don't belong in the Federal government. I think that's a fair criterion to set.