The Senate is heading toward a Christmas Eve vote to pass landmark healthcare legislation, but instead of holiday cheer, Democrats and Republicans are digging in for trench warfare. Senate Majority Leader Harry Reid (D-Nev.) is determined to finish work before the Christmas holiday and has set a schedule that would end with a final vote on the evening of Dec. 24. “We’re going to finish this healthcare bill before we leave here for the holidays,” Reid declared on the floor Thursday. But Senate Minority Leader Mitch McConnell (R-Ky.) has told colleagues that he will not give any ground on procedural...