Key members of both parties and both chambers of Congress stand before the podium to introduce their bipartisan Medicare proposal. Insurers and health care providers welcome it. Seniors' groups are on board, too. If Congress is ever going to overhaul Medicare, it will almost certainly have to happen this way. Sen. Ron Wyden, the Oregon Democrat widely expected to be the next Senate Finance Committee chairman, last week led a bipartisan group of lawmakers, health care experts and seniors' advocates backing a plan to better coordinate care given to Medicare beneficiaries.