They all are basically saying that Congress simply "can't" stop funding for President Bush's military escalation, even though, last I checked, the Constitution gives the U.S. Congress the power of the purse, and the Washington Post's Walter Pincus has previously laid out very obvious ways to use that power without putting troops in harm's way.
Here's a newsflash: The Iraq War is not Michael Jordan, and the Congress doesn't have to be Craig Ehlo - the Cleveland Cavaliers guard who got perpetually posterized by Jordan. Congress can stop the Iraq War, or at least the escalation of it, no matter how many people in Washington use these Jordan-esque descriptions to justify their own pathetic refusal to do what the vast majority of Americans want.
Thankfully, as I said, Pelosi, Murtha and Kennedy have all said they are going to use their power in the majority to, at the very least, force President Bush to get congressional approval for a military escalation. Just today, in fact, Kennedy introduced bold legislation (linked below) saying that no funds can be spent to send additional troops to Iraq unless Congress approves the President's proposed escalation of American forces. This is going to tear the Iraq War as Michael Jordan narrative to pieces, forcing lawmakers to publicly state whether they have the guts to exercise their constitutional responsibilities or not. Stay tuned.
Text of Kennedy legislation