For the second time in six months, Nick Saban is headed back to Capitol Hill. The former Alabama head coach will lead a panel discussion organized by U.S. Rep. Terri Sewell during the Congressional Black Caucus Foundation’s annual legislative conference on Thursday. Saban, who won six national championships in 17 seasons with the Crimson Tide, was previously in Congress in March for a roundtable organized by Sen. Ted Cruz. For nearly two years, the NCAA has looked to Congress to secure its long-sought antitrust exemption. Donor-led NIL collectives have popped up across the country, with more t…