The gamble paid off. More than five years after challenging what he alleges was a pay-to-play deal between racetrack owners and then-Gov. Rod R. Blagojevich, Robert M. Andalman of A&G Law LLC obtained an award for four riverboat casinos that is likely to amount to $81.8 million. “It took a lot, but justice was finally served,” Andalman said today. A federal jury on Monday found in favor of the casinos on claims that Blagojevich signed legislation in 2008 favored by the racetrack industry in return …