His brilliant 2008 campaign and the victory he achieved there was his greatest achievement. At the time, I was very glad he won, and very impressed with how well he campaigned.

Other than that, nothing much comes to mind. His Obamacare was a sad, tragic sellout to the Private Health Care industry. The recent farce in Syria has been expertly handled by Putin, not Obama, and was just another utterly spurious attempt to damage and eventually bring down an independent Middle Eastern government that is not yet in the pocket of the USA, the UK, France, and Israel. I suspect the Sarin gas attack was really made by the rebels to provide an excuse for foreign intervention, and not by Assad's forces (just as the Russians are saying). In any case, the USA government couldn't care less about humanitarian issues, and it does absolutely nothing on behalf of beleagured Middle Eastern civilians, because they don't matter to the USA government. What matters is oil, political power, and the extension of empire. American foreign policy has hardly changed at all under Obama, though he is less reckless than Bush...so far. And that is a slight improvement.