A new group bent on unmasking ‘leftists in the media’ has its first target—MSNBC’s ‘racial extortionist,’ the Rev. Al Sharpton. David Freedlander talks with the leader of the right’s answer to Media Matters. A group of conservative activists, tired of what they see as a persistent and little remarked liberal bias in the news media, are set to begin a series of boycotts aimed at advertisers who sponsor what they see as left-wing networks, outlets, and journalists. On Sunday they announced their first target, the Rev. Al Sharpton, the civil-rights leader turned MSNBC talk-show host whose PoliticsNation has grown in...