The political shenanigans, the gutless opposition, the repeated and bold-faced lies, alliances made then alliances screwed, evil people used to advance the cause then cast aside like garbage by even more evil people.
The biggest difference was Hitler's reliance on violence and intimidation to control his political enemies and silence dissent. Hitler had to silence the media criticism by ultimately seizing it and putting it under the total control of Goebbels.
Our media simply laid down on Obama's porch and volunteered to be doormats.
In my opinion, the only thing that stops Oblahblah from using violence is too many (but not all, obviously) would notice and stop him.
Then again, that never stopped the murderous Clintons.