Obama could very well make history again when the final results are in, by being the first president who won an election with an unemployment rate of 8% or higher. No president was re-elected with this status before.
As well, while each campaign stretches or distort the truth to different extents, Obama is at least attempting to appear the honest and diligent choice. In an interview some days ago, he told a reporter that he is aware of his own short-comings, referring to the sluggish economic rebound, not the one he had hoped for.
Politically he should have the support of a sizable chunk of a number of major groups - African Americans 90+% support, women (with his abortion stand), gays (with his support of their marriage), and the Latino vote. At the Democratic National Convention, there were a number of Latino speakers, including a rising star in California, San Antonio Mayor, Julian Castro, and his twin Joaquin Castro, representative from Texas, so he is covering that base.
Bill Clinton was strong at the convention, telling Americans, that no matter who was president, no one could clear it up in one term. So with this support, and the possible new perspective of what the economy was like, and how slowly it is rebounding, voters at this point seem to be still willing to give Obama a second term.
He is likeable, and perhaps many voters appreciate that as the first black President, his sense of place in history, Obama will serve with integrity, and accept his human limitations.. and in doing so, realize that the opponent Romney, also has his limitations, and weaknesses. It's getting more interesting.
History can be made again. From this blogger's chair, there is a sense that people are becoming more aware of a broader economic picture of the recession that welcomed the Obama administration, and willing once again to evolve as voters in understanding economic and recovery perspective.