10. Elena Kagan and Sonia Sotomayor
Associate Justices of the Supreme Court
Last year's rank: New
They aren't changing the ideological balance of the court, but as only the third and fourth women to serve on the bench, they've already made history -- and it won't be long before Washington sees how they wield their power.
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Last updated September 29 2010: 11:28 AM ET
