Today, Senate Majority Leader Harry Reid is expected to receive an analysis from the Congressional Budget Office (CBO) on his chamber's health care bill. Sources tell ABC's George Stephanopolous that the package will cost below $900 billion, will extend coverage to most Americans, and will reduce the deficit in both the short- and long-term. That report would clear the way for the leadership to bring the bill to the floor, perhaps by the end of the week.

One reason the legislation will score well is in the inclusion of a public option (with an opt-out clause for states), which the CBO predicts will hold down costs, even if the version eventually approved is weaker than liberals prefer. Last night, progressive senators met with Reid to reiterate the importance of the government-run plan, both as a check against insurance companies and as a testing ground for important insurance and delivery system reforms.

But both Reid and Sen. Dick Durbin aren't sure there's enough support in their chamber yet. With conservative Democrats and Connecticut Sen. Joe Lieberman already hinting they would join Republicans in a filibuster, Reid estimates they are currently three votes short of passing the procedural hump. On MSNBC last night, Durbin said he was "struggling" to whip his members. Watch it, courtesy of TPM:

Perhaps the CBO score will provide Durbin with some key ammunition. Only time will tell.