In retrospect I think we all should have foreseen an Obama reelection. In 2008 Obama got elected not based on the Democratic platform, Obama got elected as a person. There was a cult of personality around Obama. Though diminished some, that cult of personality remains in 2012. Thus it did not matter that Obama lied about Benghazi or Romney. Thus it did not matter that the economy remains as bad today as it was when he took office. Thus it did not matter that he broke so many promises. To his followers he was their guy, and their vote was his. Loyal fans cheer for their team even in losing season.
The Democrats should not assume the turn out in 2008 and 2012 will be duplicated in 2016. It wasn't about the Democratic turnout, it was the Obama turnout.