Vice President Joseph R. Biden Jr., who is president of the Senate, and three top officers of the chamber have been named in a lawsuit trying to overturn the Senate's filibuster rule. (AP Photo/Charles Dharapak)
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Vice President Joseph R. Biden Jr., who is president of the Senate, and three top officers of the chamber have been named in a lawsuit trying to overturn the Senate's filibuster rule. (AP Photo/Charles Dharapak)
