For the most part, Trump's only going to get the same groups Romney got in 2012. Polls right now are less reliable due to the two conventions. I predict things will settle down and  voters will vote for their self-interest, i.e., their wallets, their retirements, the economy, the status quo--which by most indices isn't all that bad for the majority of Americans. 
I doubt many Americans will want to play Russian roulette with a fully loaded gun by placing their future in the hands of the Donald--that's for the end time prophecy Republicans who in any case are the living dead. Their Jesus has orange hair and  needs Putin to reach around the world to give him a hand. I think most Americans find this kind of "friendliness" with Russia unsavory. I doubt a majority of voters think Donald is an example of a  competent candidate much less that would make a competent POTUS. The hideous political spasms Americans are witnessing are those of the Republican party in its dead throes.