WASHINGTON -- When it comes time to vote, every Democrat in the Senate -- and perhaps more than one Republican -- will support legislation overhauling the nation's health care system, the chairman of the Senate Finance Committee predicted Thursday.

That assertion by Sen. Max Baucus, D-Mont., was a notable show of confidence coming in the midst of negotiations with Majority Leader Harry Reid and White House officials to finalize legislation that can satisfy liberal Democrats without alienating moderates -- and get the 60 votes needed to advance in the 100-seat Senate.

Baucus told reporters that lawmakers have a moral obligation to repair the health care system to rein in costs and extend coverage to millions of the uninsured...