With both Trump and Hillary currently at 67% unstrustworthy and disliked, and endorsements are not going to do it.  The other 35% who are neither Republican or Democrat will decide this one either by choosing the President or failing to show up or voting against one of them. 

All the endorsements in the world or party zeal isn't going to solve that problem.

Demonizing the opposite party (as we see on the R-G threads) will merely accentuate the problem.