The Power List: MARY KAY HENRY

International President, SEIU, 53

The leader of the Service Employees International Union is so legit that she was arrested last November, protesting with the Occupy movement as a gesture of solidarity. Henry emerged as a galvanizing figure in the fight for economic equality and -- heading the fastest-growing union in the U.S., with a whopping 2.1 million members -- stands to become an increasingly influential backer for Obama in the 2012 election.

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