I challenge you to watch or read Joe Biden’s rambling, unfocused answers on Meet the Press and support his presidential candidacy. How long until he pulls the plug?

Biden’s defense of his position(s) on the war in Iraq was a particular lowlight:

MR. RUSSERT: But, senator, there has been an evolution in your thinking because this is what you said in—to the Brookings Institution in ’05. “We can” tell it—”We can call it quits and withdraw [from Iraq]. I think that would be a gigantic mistake. Or we can set a deadline for pulling out, which I fear will only encourage our enemies to wait us out—equally a mistake.” You’re now setting a deadline.

SEN. BIDEN: No, we’re not setting a deadline. Read what it says. It says the target date, left up to the generals to determine whether or not it is appropriate to withdraw all forces.

MR. RUSSERT: Well, a target date is setting a deadline.

SEN. BIDEN: No, no, but it leaves forces behind.

Even Tim Russert, who usually interrupts ruthlessly, frequently allowed Biden to prattle on and dig himself in even deeper.