Unfortunately the most recent poll shows 41% of those polled want Obama to be reelected. So he has a fairly decent chance of winning reelection.
I like Perry, but as Goq said his poll numbers have tanked. Cain has risen in his place, but I dont see him winning the nomination as of yet. The most likely Republican nominee imho is Romney. I cant say I love him, but he was doing well in the polls. The others- Santorum, Bachman, Gingrich, Paul etc… dont have much of a chance as of now.