This is a good point:
Power Line - How Unpopular is the Obama Administration?: "President Obama's approval ratings have declined steadily since he took office. Among likely voters, those who disapprove of his performance consistently outnumber those who approve by eight points or so. The margin between those who strongly disapprove and those who strongly approve is even greater.
I suspect, however, that those numbers actually overstate the popularity of the Obama administration. Many voters are reluctant to give up on a president they voted for, and, knowing that we are stuck with Obama until 2013, some prefer not to admit how poorly they think our president is doing. Further, Obama continues to enjoy a near-unanimous approval among African-Americans that probably reflects understandable loyalty as much as real satisfaction with the administration's policies."