Democratic presidential candidates from left, former Colorado Gov. John Hickenlooper, entrepreneur Andrew Yang, South Bend Mayor Pete Buttigieg, former Vice-President Joe Biden, Sen. Bernie Sanders, I-Vt., Sen. Kamala Harris, D-Calif., Sen. Kristen Gillibrand, D-N.Y., former Colorado Sen. Michael Bennet and Rep. Eric Swalwell, D-Calif., wave as they enter the stage for the second night of the Democratic primary debate hosted by NBC News at the Adrienne Arsht Center for the Performing Arts, Thursday, June 27, 2019, in Miami. (AP Photo/Brynn Anderson)