I have seen this point numerous times. The majority of people say the country is moving in the wrong direction, the Republicans MUST win. But Many of the people who say this don't understand how much Obama has disappointed some parts of the left.
Look at Obamacare. A majority disapproves. Have you seen the talking points on the REALLY left-wing websites? There are sentiments like:"Obama pissed away our once-in-a-generation chance for health care reform with a REPUBLICAN plan WITHOUT even a public option? Obamacare is worse than nothing because it was actually a step in the wrong direction, away from universal health care!" These people hate Obamacare just like most Republicans, but they sure as hell were never going to vote for Romney, who (they think) wants to privatize Medicare.
Many of the same people have a generally negative view of the President in that they think he is a Reagan Republican disguised as a Democrat. They think of him as the most right-wing Democrat in their lives, waging drone wars and not closing Guantanamo, bailing out Wall Street, abandoning environmental issues and capitulating to the Republicans about the Bush tax cuts. But Mitt Romney is basically the Anti-Christ, representing the worst the Republicans can offer, with more deregulation, more tax cuts for the rich, tax raises for the poor and slashing social spending while increasing the military budget. They show up in the statistics as dissatisfied with Obama, but most held their nose and voted for him, because the alternative was too terrible to contemplate.
And lastly, the lack of empathy on the right is astounding. It is one thing to be totally against a candidate so you would never ever consider voting for him, but assuming that the whole country shares your sentiment and thus dismissing the polls because they don't fit with your "reality" is the height of arrogance.