Perhaps I don't need to make the point (again) that there is essentially is no mainline liberal pundit army. There are liberal pundits, maybe lots of them, but they don't work with the kind of mission-oriented military discipline as their conservative counterparts. They're more likely, in fact, to criticize the liberal guy than to advance his arguments. For more on that, see here.
Having said that, all of the griping about Obama not being forceful enough in his response to McCain's sea of BS seems somewhat misplaced. Obama is only one guy. McCain is more than that. He has in the first place an army of pundits who will either repeat his talking points, or invent their own arguments to advance his cause, which they may see to some extent as their cause. While George Will, for instance, may not emphatically support McCain, he cares enough to argue that whether one is economically better off should not matter anymore as a reliable guide in the current election. It's a ridiculous argument, but it comes out just in time to support McCain and it seems in fact that Will thought it up all on his own. No one needs to tell him McCain needs help. On top of this pundit army, McCain also has a television network (Fox), and legions of well-disciplined bloggers.
On top of this, of course, Obama can't even count on the press. Here, for instance, is an actual exchange on the TV about the McCain campaign's tendancy to make stuff up:
ROBERTS: That would appear, Paul, to end any argument over whether or not she supported the bridge initially. But why can't Barack Obama make that point stick?
Roberts, a journalist, responsible for separating the true from the false, wonders why Obama can't make the point that the true and the false are different. That's Roberts job, at least in a normal world. What does Roberts say?
ROBERTS: We still have 56 days to talk about this back and forth.
That's just nuts.
With that, when Paul Krugman, not a huge fan of Obama, says:
Did you hear about how Barack Obama wants to have sex education in kindergarten, and called Sarah Palin a pig? Did you hear about how Ms. Palin told Congress, “Thanks, but no thanks” when it wanted to buy Alaska a Bridge to Nowhere?
These stories have two things in common: they’re all claims recently made by the McCain campaign — and they’re all out-and-out lies.
Dishonesty is nothing new in politics. I spent much of 2000 — my first year at The Times — trying to alert readers to the blatant dishonesty of the Bush campaign’s claims about taxes, spending and Social Security.
He's virtually alone. If Obama is having trouble, this is part of the reason why–there seems to be only one top shelf pundit making actual arguments in his favor.