At Tea Party and conservative events, the press routinely seeks out any shred of evidence of far-right extremism, racism or even uncivil behavior exhibited by attendees. If found, it then tries to portray even one or a few such people out of thousands as somehow typical. Rallies in support of liberals' pet causes get a completely different treatment. The press almost invariably ignores rampant left-wing extremism clearly on display. Sunday's "Climate March" in New York City, along with other smaller marches in other parts of the world, exemplifies the blatant double standard. The Blaze, Gateway Pundit, and others reported no...