Davis maintained his innocence up to his execution. In the 20 years between his conviction and execution, Davis and his defenders secured support from the public, celebrities, and human rights groups. Amnesty International and other groups such as National Association for the Advancement of Colored People took up Davis's cause. Prominent politicians and leaders, including former President Jimmy Carter, Rev. Al Sharpton, Pope Benedict XVI, Archbishop Desmond Tutu, former U.S. Congressman from Georgia and presidential candidate Bob Barr, and former FBI Director and judge William S. Sessions called upon the courts to grant Davis a new trial or evidentiary hearing. In July 2007, September 2008, and October 2008, execution dates were scheduled, but each execution was stayed shortly before it was to take place.