This combination photo shows, top row from left, Presidential candidates, Sen. Kamala Harris, Sen. Elizabeth Warren, Sen. Bernie Sanders, middle row from left, former Congressman Joe Walsh, Sen Cory Booker and South Bend Mayor Pete Buttigieg, and bottom row from left, Former Massachusetts Gov. Bill Weld, former South Carolina Gov. Mark Sanford and former Congressman Beto O’Rourke, who will participate in an hour-long special about climate change, airing Nov. 7. (AP Photo)
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