State Treasurer Timothy P. Cahill, an independent candidate for governor, today offered a wide-ranging and scathing criticism of the state’s universal health care law, saying it is bankrupting Massachusetts and will do the same nationally, if a similar plan is passed in Congress. "If President Obama and the Democrats repeat the mistake of the health insurance reform here in Massachusetts on a national level, they will threaten to wipe out the American economy within four years,” Cahill said in a press conference in his office. Echoing criticism leveled by Congressional Republicans in recent weeks, Cahill said, “It is time for...