The USA is not a one-party state and there is significant opposition among the populace; Nazi Germany was (never mind abandoning “democracy”) and also had a significant number of its population on board. Apples and oranges comparison.
Hang on. Hitler didn’t waltz into a ready-made scenario although some of the movement existed prior to his involvement - he was, for better or worse, there from the start i.e. before the one-party state existed.
But that is a diversion, admittedly introduced by me, from the original point: that while Obama may be an ideologue he is still president and wildly ineffective at steering the ship of state because he wants tight turns at full throttle.