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Earlier this year, Obama was named the world's second-most admired woman, behind Angelina Jolie, in a YouGov poll.
While acknowledging she did not care much for politics, Obama said Biden's steady and empathetic approach to problems was the answer and urged voters to stand in line or do whatever it takes to ensure they can beat Trump.
The documentary marks the feature directorial debut of cinematographer Nadia Hallgren.
Fifteen per cent of the 1,025 Americans polled said the woman they admire most is Michelle Obama, who is currently on a tour promoting her book 'Becoming.'