WASHINGTON (AP) Republican senators say chances of reaching a bipartisan deal to overhaul health care dimmed after President Barack Obama issued a letter strongly supporting a new public health insurance plan. A public plan that would compete with private insurers is opposed by nearly all Republicans. Until Wednesday, the administration had been treading lightly on the issue while emphasizing hopes for a bipartisan bill. President Barack Obama says he's open to requiring all Americans to buy health insurance, as long as the plan provides a "hardship waiver" to exempt poor people from having to pay. The Associated Press: GOP senators: Bipartisan health deal tougher now I would not even know where to begin with this, would someone please tell me where in the constitution the Fed. has the power to require an individual to purchase goods from a private company?