Libya: Rebels can't advance without air support

I hate to play Captain Obvious, but the first lesson learned from the Libya campaign: Without some help from above, tanks beat trucks. From today’s CSM:

The rebels can advance easily along the sparsely inhabited desert running west towards Sirte, Qaddafi’s hometown, as long as foreign warplanes are plowing the road in front of them; Absent that air support, Qaddafi’s army drives them relentlessly back.

I know we got into this so President Obama wouldn’t have to see pictures of mass graves. But until the rebels win, there’s no way we can get out. And yet regime change isn’t our policy.

Shouldn’t we be in it to win it?