Where do you stand on journalists expressing their opinions via social-media outlets, like Twitter? MSNBC chief Washington correspondent Norah O'Donnell made her stance fairly clear Wednesday with a three-word Tweet lambasting South Carolina Gov. Mark Sanford, "Sanford equals pathetic."

Sanford held an emotional press conference Wednesday during which he admitted to an extramarital affair with an Argentinean woman. He had not been seen in public since June 18, and his staff said he was hiking in the Appalachian Trail while he was actually in Buenos Aires.

MSNBC has faced objectivity issues in the past, removing Keith Olbermann and Chris Matthews from its election coverage in September. But does a three-word Tweet have the impact of expressing an opinion on live television?