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6. Lisa Jackson
Lisa Jackson
EPA Administrator
Last year's rank: New

With Obama's climate-change agenda stalled in Congress, Jackson is tapping her agency's authority under the Clean Air Act to start regulating greenhouse-gas emissions. Her leeway for setting standards is a nightmare scenario for industry, which is gearing up for a court fight.

NEXT: Olympia Snowe and Susan Collins

Last updated September 29 2010: 11:28 AM ET
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