 "Donnie" Walker, a one-time bingo regulator in the state government who later became a lobbyist, pleaded guilty to offering McNally a $10,000 bribe in exchange for his vote on a measure to legalize horse racing.In exchange for a plea bargain, Walker gave investigators details on how he had helped bingo operators become chartered as bogus charities so they could obtain state licenses to run bingo games, and how bingo operators then channeled money back to state legislators who were part of the scheme.At the height of activity there were nearly 300 bingo operations in the state with estimated annual revenue of $31 million.