Given the historical nature of his presidency, the "rules" are thrown away. There is every reason to believe the electorate will err in his favor regardless of the objective merits of his case for reelection.
If he was John F Kerry or John McCain, a second term would not be in the cards.
Romney has to convince voters there's no reason to feel guilty, racist, afraid of judging Obama on his actual record and finding this president's not lived up the to challenge and, like predecessors similarly positioned, needs to be let go.
In light of his failure, Obama knows how critical the race card is to his reelection and that's why his surrogates used it everywhere they can. He is .