Heavyweight conservatives and banterweight conservatives are lining up on both sides the Comcast/Time Warner merger. The heavyweights, which include Grover Norquist at Americans for Tax Reform, Wayne Crews at the Competitive Enterprise Institute and Duane Parde at the National Taxpayers Union, have penned a letter to influential Senators including Mike Lee, Chuck Grassley and Ted Cruz, urging them to look past the politics and approve the merger between the two cable giants on traditional grounds—you know, the grounds under which the anti-trust laws were written and passed in the first place? “As advocates for a free market,” the heavyweights write,...