The ACC has the most championships and highest winning percentage in the tournament since the 64 team expansion. In recent history it’s mainly Ben the ACC and Big East winning the most in the tournament.
You must work for ESPN. Yes, thanks to Duke and North Carolina. Teams that often lose, yet barely fall. And in some cases they lose and actually move up in polls. Which gets favorable tournament seeding. (Cute gig if you can get in on it), but it's this exact type of incestuous circular reasoning that has teams like NC, Virginia tech, Florida state, NC state over ranked. It's the same type of reasoning that decries Virginia's "efficiency," which doesn't mean squat when they get into the tournament and flame out like clockwork. And it's this same type of reasoning that gives Duke losses to a lowly little sec team like South Carolina, 14 seeded Mercer in the first round, or 15 seeded mighty Lehigh. Because gosh darn it, that ACC is so darn good. Just ask Bilas, or Jay Williams, they'll tell ya. The Acc circle jerk.