Proven loser? He won 2016 against all odds(and your own efforts and predictions at the time). He literally rolled out of bed one day, decided to become President, and made it happen. That's a winner. He's literally in virtual tie with the incumbent, despite facing 9000 indictments, and his alleged "atrocious" Presidency that nobody liked. That's a winner. He had the second most votes in history. You don't throw that away, and put your faith in a bland suit that has absolutely no chance at winning.
Nobody is throwing their vote away on Trump. Those would be the guys voting for Tim Scott, Nikki Haley and the rest of the losers, who can't get past 20% in their own party, let alone a national election.