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Fannie Lou Hamer, Ashton Carter, Robert Francis Kennedy, and George W Romney were awarded posthumously.
Earlier this year, Obama was named the world's second-most admired woman, behind Angelina Jolie, in a YouGov poll.
The former White House intern had exposed US President Bill Clinton in 1998 leading to his impeachment.
The non-profit organisation has been working towards the upliftment of women in rural India for over four decades.
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