It's really early, but things are looking good for Obama at the moment. His approval rating is now at 50% (while Congress' rating continues to be at all-time lows) and he's comfortably ahead of any of the Republican challengers in polls.
What really worries me though is this looming conflict with Iran. That is likely going to cause oil prices to skyrocket and cause the economic recovery to stall right before election time. Obama will get the blame for that, whether it's his fault or not.