My problem with this argument that (I think) you've been making in this thread for the last few days is that you don't seem willing to allow that people sometimes mess up. Obama deserves blame if he fell short of what he should have done, but obviously the expectation can't be that the Democrat must run a perfect campaign. And, really, the Obama campaign was generally excellent up until that debate.
What people are pointing out to you is that if conservatives are willing to cover for their guy when he screws up and liberals aren't, then that gives the Republican a substantial advantage; he can run a worse campaign and still get elected. When conservatives with platforms all say the Democrat sucked, and liberals with platforms all say the Democrat sucked, guess what low-information voters are going to take home. It's not crazy to suggest that liberals with platforms should keep their influence on low-information voters in mind when they talk about politics; I note that you're already suggesting that one liberal needs to modify his presentation in order to help the Democrats win the election.
I don't think MSNBC even needs to try to sell Obama as having crushed Romney in the debate. They just need to not talk about Obama losing the debate. Their first, second, and third reactions should have been outrage at Mitt Romney lying to the American people for an hour and a half.
Thank you! You conveyed what I was saying perfectly. When liberals buy in and help feed the conservative narrative, is it any wonder why the Dems lose so often? MSNBC's meltdown was a damn perfect example of this.