Senator Al Franken (D, Minn.) has been one of the most vocal critics of the proposed merger between Comcast and Time Warner Cable and now he’s trying to bring in the big guns to help him kill it once and for all. Franken on Wednesday sent a letter to Netflix CEO Reed Hastings asking him or his company to publicly weigh in on a merger that Franken says will hurt competition for online video services going forward. “My concern is that Comcast will be able to use its clout in the broadband distribution market to obtain an anticompetitive advantage in the content market,” Franken writes. “Comcast can achieve this by blocking, degrading, raising costs for or otherwise interfering with unaffiliated