Trump's campaign is exclusively focused on motivating his base.
But his base is shrinking.
https://news.gallup.com/poll/315734/party-preferences-swung-sharply-toward-democrats.aspx?utm_source=twitterbutton&utm_medium=twitter&utm_campaign=sharing
Since January, Americans' party preferences have shifted dramatically in the Democratic Party's direction. What had been a two-percentage-point Republican advantage in U.S. party identification and leaning has become an 11-point Democratic advantage...
Four months before Election Day, Democrats appear to be as strong politically now as they were in 2018 when they reclaimed the majority in the House of Representatives and gained seven governorships they previously did not hold.One can argue, maybe, that some persons don't want to self-identify as "Trump voters" when polled, but party affiliation is a different kettle of fish.