The hip-hop star Pras takes a risk by buying a Super Bowl ad for his new black culture site. The ad he and director Antoine Fuqua come up with is a winner, as well as arguably the most political of the night. He comes on stage blindfolded and with tape over his mouth. He removes the covering. “A voice and a vision for Black Culture,” says the text. This, remember, is amid the championship game for a sports league that has effectively blackballed a talented quarterback who protested on behalf of fellow African Americans.