New federal deficit numbers in combination with concerns that some voters have expressed at town hall meetings this August over the size, scope and cost of health care legislation may lead lawmakers to reconsider elements of the measure Democrats want to pass this year. The death of Sen. Edward M. Kennedy, D-Mass., may create new momentum among Democrats and Republicans to resolve their differences over the bill, but the many complexities involved with any overhaul of the nation’s health care system guarantee a lengthy debate this fall.

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