Pay-TV set-top market critics Sens. Ed Markey (D-Mass.) and Richard Blumenthal (D-Conn.) have brought in the reinforcements, including presidential candidate Bernie Sanders (I-Vt.). Markey and Blumenthal asked for, and got, set-top box info from Comcast, DirecTV, Dish Network, Time Warner Cable, Charter Communications, AT&T U-Verse, Verizon FiOS Video, Cox Communications, Cablevision Systems and Bright House