Libyan rebels were pushed out of the oil town of Zawiyah today under a heavy assault by pro-Qaddafi forces on the ground and in the air. Things aren't looking too good for the rebels right now: They've lost a lot of momentum, and President Obama, though he's stuck with the "Qaddafi must go" line, has refused to offer any real support to rebel forces. All he would say in a press conference today was that when it comes to U.S. military actions, whether it's a no-fly zone or other options, you've got to balance costs versus benefits. And I don't take those decisions lightly."

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