Democrats in 2009 moved to vastly expand the size and scope of government. But with the public already souring on Washington, 2010 may see limits on the new largesse. The clearest example is health care. As legislation to overhaul one-sixth of the economy contorted and morphed to pass the Senate, support plunged. The health bill may go through, but with midterm elections looming, other big items on the liberal agenda could stall.