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Former Housing and Urban Development Secretary Julian Castro, from left, Sen. Cory Booker, D-N.J., former Vice President Joe Biden, Sen. Kamala Harris, D-Calif., Andrew Yang, and Rep. Tulsi Gabbard, D-Hawaii participate in the second of two Democratic presidential primary debates hosted by CNN, July 31, 2019, in the Fox Theatre in Detroit. (AP Photo/Paul Sancya)