WASHINGTON, Dec. 6 (UPI) -- President Obama prepared to rally Senate Democrats Sunday on a healthcare bill bogged down by abortion, a public option and a Medicare panel, officials said. Obama was to meet with Majority Leader Harry Reid, D-Nev., and other Senators in a rare Sunday session ahead of possible debate Monday on key amendments. Conservative Sen. Ben Nelson, D-Neb., has threatened to filibuster reform legislation unless it contains restrictions on abortion coverage and the Senate has yet to find common ground on a government-run public option for health insurance. Also up for discussion is the scope of an...