Democrats likely are. To win though you need the Independents.
Really? It seems a large number of Republicans who voted for Donald Trump in '16 have had enough, and will vote for VP Biden:
Republicans who voted for Trump say they are “riddled with guilt” in the spot set to air on Fox News.
www.yahoo.com
and,
Pollsters and political scientists question how much of an impact — if any — these GOP critics might have on President Trump's fate in November.
www.npr.org
The only hope The Donald has is voter suppression, and his effort to suppress the vote is to claim a vote by mail would be rigged to defeat him. I suspect he really believes this, when one tells the same lie over and over it can become reality in the brain of the liar.