Hillary Clinton had a tense exchange with an NPR host in an interview airing Thursday June 12, 2014  over whether she made “a calculus” against publicly supporting gay marriage before endorsing it last year.

It’s the first time Clinton, a potential candidate for president in 2016, has been extensively questioned about her support for gay marriage. She did not back it in her 2008 presidential campaign but she issued support for it by video in 2013, weeks after leaving the State Department.

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