The fate of President-elect Obama's efforts to limit global warming could hinge on who wins a fight among House Democrats.
California Rep. Henry Waxman is hoping to succeed Michigan's John Dingell as chairman of the House Energy and Commerce Committee. Dingell has been the panel's top Democrat for 28 years and a key ally of automakers and electric utilities.
Last month Dingell helped unveil a bipartisan draft bill to reduce greenhouse gases by 80 percent by 2050. But environmentalists and some liberal Democrats see Dingell as an obstacle to stricter fuel economy standards for cars and trucks, and cleaner fuels also advocated by Obama.