Obama is simply following the Status of Forces agreement that Dubya signed in 2008. Quite frankly even if you credit him with the troop reductions in Iraq, I can't give him credit for bringing the troops home from Iraq 3 years later than he could have in a war that should of never been fought. Obama has done absolutely nothing out of line with his Wilsonian/neoconservative foreign policy. Our military budget is larger than ever, Guantanamo Bay is still open, the war in Afghanistan has expanded, we're waging covert wars in Pakistan/Yemen/Somalia and god knows where else, we recklessly intervened in Libya, assassinating US citizens, starting some new adventures in Uganda and central Africa, and I'm starting to wonder what they're planning to do with Syria and Iran.
There is only 1 candidate that is committed to peace and non-interventionism and that's Ron Paul.