** ADVANCE FOR SATURDAY DEC. 10 - FILE ** House Energy Committee Chairman Rep. W.J. Tauzin, R-La., left, talks with Rep. John Dingell, D-Mich., right, Sept 3, 2003, in Washington prior to the committee's hearing on the August 2003 electrical blackout. Dingell celebrates his 50th anniversary in Congress on Tuesday, Dec. 13, 2005, making him the third-longest serving House member in history. Some of the most significant pieces of legislation during the last half century bear Dingell's influence _ from Medicare and endangered species to water quality and clean air _ and he has been an unabashed supporter of the auto industry. (AP Photo/Pablo Martinez Monsivais/File)