Like all mergers, the proposed $45.2 billion Comcast CMCSA +1.67% merger with Time Warner Cable TWC +1.3%—the largest and second largest cable providers in the nation—has its advocates and critics. There are certainly important questions about what impact the merger would have on consumers—but there are equally significant issues associated with the highly politicized approval process. The Obama Department of Justice, led by Eric Holder, must review the merger and decide whether to approve or block it. Unfortunately, the Obama Administration and Justice Department have a long track record of pushing the rule of law aside and making decisions based...