In this Feb. 26, 2008, file photo, Rep. Henry Waxman, D-Calif., questions witnesses during a hearing on Capitol Hill in Washington. House Democrats will decide a bruising intra-party battle Thursday as they vote on whether to topple veteran Rep. John Dingell as chairman of the committee with oversight of energy and global warming and replace him with Waxman. (AP Photo/Manuel Balce Ceneta, File)

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