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Last week, Nicholas Kristof, an Op-Ed columnist at The Times, published a piece on what he believes to be an injustice in California — a case in which a life hangs in the balance. We asked Mr. Kristof to discuss reaction to his column.

Pressure seems to be growing on Gov. Jerry Brown to allow advanced DNA testing in the case of Kevin Cooper, a black man on San Quentin’s death row for the brutal 1983 murder of a white family.

After my in-depth column in the opinion section on the case, Senator Kamala Harris has called on the governor to allow testing and so has John Chiang, the state treasurer and a candidate for governor.

As my column notes, I believe Mr. Cooper is innocent and was framed for murder by the San Bernardino County Sheriff’s office. What’s striking about the case is not only that the evidence against Mr. Cooper has mostly been discredited, but also that there’s growing evidence against a particular white man who also happens to be a convicted murderer (he wasn’t happy to hear from me).