*YAWN*
I'm so used to hearing, 'Trump is Hitler!' since 2015, this is tame and stupid.
Then they went to Trump is an anti Semite for a short while. That simply was too stupid even for Liberals. Beside that, most of them are fanatic anti Semites themselves, so it was not a good selling point in the Liberal crowds.
But yes, once you throw out the 'Trump is Hitler' card over and over a thousand times, it is difficult to top that. The Democrats could try 'Trump is Satan'? Except that would offend Satan Worshipers which are all Democrats. So that will not work either.
The Liberals have already gone so far over the line with insults, they are struggling now to come up with something that will get any attention. That's where they came up with that 'suckers and losers' lie. They know it is an insane accusation that very few will believe, but it is the only card they have left to play.