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How could Sheila Dixon not know of DeRay Mckesson?

Sheila Dixon, who wants to be mayor of Baltimore again, says she'd never heard of DeRay Mckesson before he filed as a candidate for the same office. In telling a Baltimore Sun reporter that, Dixon sounded out of touch. Or maybe she was being disingenuous. Either way, she does not look good.

Mckesson has 299,795 followers on Twitter; he's been one of the most prominent activists for justice and reform since a police officer shot Michael Brown to death in Ferguson, Mo., a year and a half ago.

Mckesson is from Baltimore. He is one of the best-known faces and voices of the Black Lives Matter movement. He's made appearances on national television; he's been the subject of...