Our new poll suggests that liberal unhappiness with Barack Obama is still largely anecdotal and not very widespread. His approval rating with liberal Democrats is 95%, with only 3% disapproving of him.
On health care 88% of voters in that group say they're with Obama and only 7% are opposed. We simply are not seeing any broad evidence of push back toward him from the left for not advocating for single payer.
There is a little more unrest with him on Afghanistan. 68% of liberal Democrats support his approach there with 22% opposed. Even with those who disagree with him on the issue 81% express approval of his overall job performance so it doesn't seem to be a deal breaker by any means.
Certainly media outlets can go out and find some individuals on the left disenchanted with Obama if they want to push a Democratic disunity narrative but it's hard to make much more than an anecdotal case on that front. For the most part liberal Democrats are pretty content with Obama.