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Former Academy president Gregory Peck made a controversial decision back in 1968. He allowed Barbra Streisand to become a voting member of the Academy without the usual two-year wait period following a first film release.
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She then voted for herself in the 1968 Best Actress race, causing a tie. Katharine Hepburn in The Lion in Winter and Streisand in Funny Girl were the first ever exact tie winners.