Ohio’s public colleges and universities are asking lawmakers for a collegiate sports betting ban as the state moves to authorize sports wagering, saying that bets on amateur athletic contests could compromise those sports. Several lawmakers asked Johnson how the state could realistically enforce a ban, especially with a program as prominent as Ohio State football. Rep. Gary Scherer, a Republican from Circleville in central Ohio, said he had personally placed a bet in Las Vegas for Ohio State to win the national football championship this season. Ohio State supports such a ban. Wagering on collegiate sports runs the risk of…