The egg that is the president’s health care reform legislation is starting to crack. A court has ruled the bill unconstitutional. The Senate has moved to repeal by a huge margin the onerous paperwork nightmare the bill imposes on small businesses. More significantly, a select group of Democrat senators are looking for ways to legislatively roll back the individual mandate provisions of the law -- undermining key partisan unity that is keeping the law in place. Sens. Jon Tester (Mont.), Joe Manchin (W.V.), Claire McCaskill (Mo.) and Ben Nelson (Neb.) (aka the “vulnerable caucus”) -- all of whom are up...