Sarah Palin can't expect anyone to take her seriously as a presidential candidate--not after what she said this week. In recent days, the former Alaska governor and Tea Party fave has been on a tear against Journolist, a listserv for nearly 500 journalists, policy wonks, and academics, most of whom are self-identified liberals working for self-identified liberal outfits. The participants on this off-the-record email chain promoted their work, debated politics and policy (occasionally quite sharply), and traded and tested ideas for articles and columns. Last month, The Daily Caller, a conservative website, began running articles based on Journolist archives it...