On Monday night, CNN anchor Soledad O’Brien, guest-hosting Anderson Cooper’s show, took on Romney-campaign spokeswoman Barbara Comstock about Paul Ryan and President Obama’s treatment of Medicare cuts. Newsbusters noted this exchange because O’Brien, ostensibly a moderator on an objective news network, can be seen shuffling a printed op-ed from the rabidly liberal Talking Points Memo entitled “The Myth Of Paul Ryan The Bipartisan Leader.†TPM may be a biased outlet, but the problem is not so much that she was using their information (she was actually just using it to cite a quotation) as that she was making a...