As it turns out, Senate Democrats may not be able to force healthcare legislation through the chamber on a simple majority vote. Republicans say they have found a loophole in the budget reconciliation process that could allow them to offer an indefinite number of amendments. Though it has never been done, Sen. Jim DeMint (R-S.C.) says he’s prepared to test the Senate’s stamina to block the Democrats from using the process to expedite changes to the healthcare bill. Experts on Senate procedural rules, from both parties, note that such a filibuster is possible. While reconciliation rules limit debate to 20...