From Bianca Jagger's letter (Bianca is the Goodwill Ambassador to the Council of Europe, Founder and Chair, Bianca Jagger Human Rights Foundation and a Member of the Executive Director’s Leadership Council, Amnesty International USA):

Executive clemency is meant to be a failsafe where the courts have been unwilling, or unable to act....In this case the US judicial system has failed to establish Mr Davis’s guilt beyond reasonable doubt. To execute him under these circumstances would be an appalling miscarriage of justice.

Whether one supports or opposes the death penalty, a central tenet of the American justice system is that those who receive the government’s harshest punishment, the death penalty, must have been proved guilty beyond reasonable doubt. Too many troubling doubts remain in the case of Troy Davis.

...If the death sentence is carried out in this questionable case, it will be an egregious miscarriage of justice, which will shame both Georgia and the US legal system. Troy Davis’s execution would only serve to complete the cycle of violence. By commuting his sentence, the state of Georgia will demonstrate her unwavering commitment to upholding the law, and the principles of fairness and justice.

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Troy Davis at Amnesty International USA and at NCADP.