Democratic 2020 U.S. presidential candidates (L-R) author Marianne Williamson, U.S., Rep. Tim Ryan, U.S. Senator Amy Klobuchar, South Bend Mayor Pete Buttigieg, U.S. Senator Bernie Sanders, U.S. Senator Elizabeth Warren, former U.S. Rep. Beto O'Rourke, former Colorado Governor John Hickenlooper, former U.S. Rep. John Delaney and Montana Governor Steve Bullock pose together before the start of the first night of the second U.S. 2020 presidential Democratic candidates debate in Detroit, Michigan, U.S., July 30, 2019. REUTERS/Lucas Jackson