The Senate is prepared to take two more key procedural votes today on overhauling the nation’s healthcare system. A final vote on the legislation is expected on Christmas Eve. On Monday, the American Medical Association endorsed the legislation, and President Obama described the Senate’s actions as historic. But many progressive supporters of President Obama have decried the Senate legislation in part because Democrats removed a proposal to create a government-run insurance program. Many questions still remain over how congressional leaders will merge the House and Senate bills.