Okay here we go, I found them again.
There are 207.6 million eligible voters in the U.S. The number who voted is 123.7 million. About 40.4 percent didn't vote. Obama won with 62.6 million votes. He got 30.2 percent of eligible voters' possible votes. Romney, of course, did slightly worse. ( Courtesy of Michael Rozeff who is neither right nor left)
Plus Obama won by 7.25% last time but this time by 2.8% and he didn't win the Independent vote either.
IMO this shows unhappiness with the candidate choices. Polls during the election season showed the same, including unhappiness with both parties. Not liking the direction of the country is another thing that has consistently shown in polls starting under Bush in his second term.
Rather than getting too cocky, I'd say both parties have work to do.