The issue is not who should win but we have to have a look at American history for getting the answer to the question as to who will win, in the past 125 years history of America there were only 4 American presidents who lost while seeking a re-election, so there is very less chance of Obama not being re-elected, also the ground he lost in the first presidential debate to Romney, he more than covered for it in the next two presidential debates, so there is nothing to worry about for Obama as far as his re-election campaign goes, the thing which will be interesting to see now is the winning margin of Obama.