Those Obummer apologists that truly believe he has a shot at winning either don't know anything about elections or can't count. EVERY election results in each candidate getting their base out to vote. Obummer has his base. Romney (presumably) has his. Obummers base will never vote for Romney and vice-versa. Then, each candidate fights for the middle.
The Obummer base is about 35% of the population - Blacks, illegals who have fake ids, the LGBT crowd, environmentalists, union thugs, criminal gangs in Atlanta who beat up gays, gays that get beat up by criminal gangs in Atlanta, the hopey changey crowd that still believes the bullshit, the OWS people who hate the 1%, Wall Street 1%ers who've sunk their $$ into him, etc.
Romney's is the job creators, business owners, middle class people who have jobs and can take care of themselves, church goers (especially Catholics and Mormons), military, people who paid for their own education, supporters of Israel, people who fund the tax base, etc.
Then there are the middle 3rd independents. By this post, 80% of the middle third goes for Romney. I think the number is high, but Romney gets the middle 3rd just because Obummer has pissed off more people than he has paid out.
Then wrap that all into the electoral college and poll each state. You'll find that Obummer loses big.