FILE - In this June 24, 2013, file photo, the Capitol Dome is seen behind the Capitol Power Plant in Washington. Democrats running for election in key states are worried about the political fallout from unprecedented greenhouse-gas limits soon to be announced by fellow Democrat Barack Obama's administration. They wish Obama would wait until after November's elections, but if he doesn't start now the rules won't be in place by the time he leaves office. (AP Photo/Carolyn Kaster, File)
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