The public option looms large in the minds of voters and certain lawmakers, but not so much in the Senate health care bill. There it limits eligibility, kicks in late, includes an opt-out provision for states, and is expected to cost more than private plans. Leaders say they had to weaken it to round up the 60 votes they need to move the bill forward. Still, its inclusion continues to jeopardize needed support for passage, because several members of the Democratic caucus adamantly oppose any public option.