The proposal to expand Medicare, seen as a breakthrough by some in the health care debate, is meeting resistance from three of the Senate's Moderates.
Independant Joe Lieberman said that he is, "increasingly concerned about the prospect of growing Medicare."
Ben Nelson (D) Nebraska worries that it could be the first step toward more federal control of health care.
Olympia Snowe (R) Maine suggested Thursday that she would more than likely oppose the plan. She said lowering the eligibility age for Medicare was on the same level of concern that she had for the public option.
The Senate is waiting for the Congressional Budget Office to "score" the Medicare expansion proposal.
