Well he did do something at least about health care. Obama has come out for gay rights, which no us president has ever done.
He also at the very least put in some new regulations regarding wall street, which is more than you can say for any post FDR president.
In the non-insane world, being for gay marriage is perfectly in line with the conservative philosophy - just not the
social conservative one. Ideally allowing homosexuals to get married is a matter of individual liberty and smaller government, because the government should not be allowed to have any say in stopping the happiness of consenting adults. The debate keeps getting framed in such a way and hijacked because of of obscene religious nutjobs.
Obama's health care plan as is was the Republican health care plan in many ways for the past
twenty thirty years prior to his election; it's not even a particularly liberal plan at all in its current state. If Obama had got the public option it might have been somewhat more liberal, but as it stands now it's just Romneycare and Reagan's dream health care plan repackaged with some slight modifications.
I like a lot of what Obama has done (and hate plenty too), but the only reason he seems liberal is because the MODERN conservative movement is batshit insane, kidnapped by the visibility of the tea party movement and social conservatism and their conscious strategy to take back the White House by simply saying "NO" to whatever he says.
That's why people like Kosmo and others seem so fake - they're not really conservatives, they're just Republicans. They will follow the Republicans off a cliff, whether they stand true to conservative principles or not.