With less than 50 days before the election, the candidates vying to replace Attorney General Lisa M. Madigan went head-to-head for the first time, focusing much of their time on a comment made nearly 20 years ago.The debate between Democratic state Sen. Kwame Y. Raoul, Republican Erika N.L. Harold and Libertarian Bubba Harsy was held by the Chicago Sun-Times’ editorial board Tuesday. The candidates talked about legalizing marijuana and their stance on gay adoptions and continued to take jabs at each other for their …