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WASHINGTON, DC - SEPTEMBER 29: Anti-death penalty activists, including members of MoveOn.org and other advocay groups rally outside the U.S. Supreme Court in a final attempt to prevent the execution of Oklahoma inmate Richard Glossip on September 29, 2015 in Washington, DC. Legal experts, death penalty opponents, and hundreds of thousands of ordinary Americans have fought tirelessly to prevent the execution of Glossip. (Photo by Larry French/Getty Images for MoveOn.org)

WASHINGTON, DC - SEPTEMBER 29:  Anti-death penalty activists, including members of MoveOn.org and other advocay groups rally outside the U.S. Supreme Court in a final attempt to prevent the execution of Oklahoma inmate Richard Glossip on September 29, 2015 in Washington, DC.  Legal experts, death penalty opponents, and hundreds of thousands of ordinary Americans have fought tirelessly to prevent the execution of Glossip.  (Photo by Larry French/Getty Images for MoveOn.org)