The media is extremely biased at this point - so you hear constantly of Obama's popularity going down. I've heard it so often, usually with no numbers, that if I were not following things, I would assume that he was near where Bush was in 2008. He's not.
In spite of 2 wars, an oil spill, an economy still battered by bubble bursting in 2008 and its echoes around the world, look at his job approval. It has been close to constant since August 2009. (Today is another bad point)
http://www.gallup.com/poll/113980/gallup-daily-obama-jo... Remember that some of the not approving is on the left. Against any Republican, he will get their votes.
No one can predict the crises that can happen before them, but one thing is predicable. President Obama will calmly deal with them. (I am arrogant enough to thing that the media call for him to show more anger is wrong. It might be better TV for them, but when many things are simultaneously exploding at the same time, I think people want a calm, steady response. In 2012, Obama will be the incumbent and his opponent will have the difficult task of showing they could provide a steady hand while they express frustration or criticism of what Obama did. That is NOT an easy thing to do.