To be fair no current President should be fully evaluated against all past Presidents until his term is up. Obama may actually do something right over the next 14 months or so which could keep him from being in last place. Hold on, he had Osama Bin Laden Killed so he did do one thing correctly so far.
I really enjoyed reading the following:
This proves that it is really difficult to fool the American public over the long-term. I suspect that the 33% who found him to be the worst President will grow in a big way over time.