DiA asks "if a state was demonstrated to have killed an innocent person, would this move public opinion on the question of capital punishment?":
An October 13th Gallup Poll found that more than half of all Americans who support the death penalty believe that someone innocent has been executed in the past five years. (About two-thirds of Americans support capital punishment, a figure that has been steady for years.) David Dow, the director of the Innocence Project of Texas, argues that this is not surprising. "Most people, whether they’re death penalty supporters or not, are going to acknowledge that the system makes mistakes," he says. He argues that for capital punishment, as with everything else, it comes down to a cost question: can a state afford to execute people, with all the years of legal wrangling that usually entails?