His social policies will be debated, but he will remain high in the rankings because during a period of great national distress, he held the heart and sole of the nation in his hands and carried them safely through. The impact of that may be lost on the general publics impression, but historians will always rate it highly.
Just like clinton did.
But seriously I think his reputation will tarnish as future, more conservative generations look at what he really did, like here.
Hey, I'm an optimist.