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6 decades of pot PSAs

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February 21, 2014 4:29 PM EST The coverage of marijuana in PSAs, politics and pop culture has evolved quite a bit since the 1960s. See how the messages about pot have changed as much as the faces delivering them, from Sonny Bono to Barack Obama. (Gillian Brockell contributed to this video) (Kate M. Tobey / The Washington Post)

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