A big part of Romney's loss is Sandy and Christie. That really hurt Romney. He was out of the news for 3-4 days a week before the election.
Secondly, America has become a welfare state. Obama won with a message of big government and more taxes while we're in 16 trillion dollars in debt and 7.9% unemployment. Obama has crushed the middle class and the "evil" 1% has gotten richer under Obama. The gap between rich and poor has increased under Obama and poverty is up. Obama has done NOTHING for the middle class but the promise of more government is enough for them to support the Obama lie.