There is no doubt that FDR was at least a quasi-socialist who saw the Depression as an opportunity to force aspects of socialism on America. However, though he was misguided, he believed that his policies would strengthen the American economy. On the other hand, Zero is a full-fledged Marxist who is either too stupid to realize that his policies will destroy America's economy or realizes this and is doing it anyway because that's his intent.
Additionally, FDR did understand that America had very real and very dangerous foreign enemies and he was prepared to stand up to those enemies no matter what. FDR understood that world peace REQUIRED American military strength. Zero WANTS America to be weak.
I think, if it's looked at objectively, Zero is far to the left of FDR.