A top White House adviser said he doubts two Senate Republicans at the center of healthcare talks are negotiating seriously, as Democrats adopted a new, more confrontational tone accusing key Republicans of blocking change. Senior adviser David Axelrod, responding to recent broadsides against Democratic health plans, said Democrats would reach out to other Republicans to finish a deal this year. He added that President Barack Obama is considering laying out a more detailed vision of what he wants in a health-overhaul plan.