WASHINGTON – Eight months in office, Barack Obama has now pushed closer than any other president in generations to creating a basic health care safety net for working Americans. Yet the fate of legislation delivering on his goal is far from certain: Republicans are nearly unified in opposition, Democrats hardly united in support. Indeed, few if any of the major arguments about the scope and costs of the historic undertaking are settled as congressional leaders prepare to take legislation to the floor in the next two weeks. Democrats on the Senate Finance Committee came together early Friday — after 2...