If Trump didn’t exist, they would be comparing any Republican candidate to Hitler. We would hear reports about how black churches would burn if the Republicans win. That’s been the Democrat party modus operandi as far back as I remember.
But Trump makes their job easier with his antics and his statements. And any Republican, other than Trump, would force the Democrats to defend their record.
The Democrats tried this with Ronald Reagan when he ran in the early months of the 1980 campaign. It’s during the debates, and as the American people started paying attention more, realized that Reagan wasn’t the monster that the Democrats were making him out to be.