Gov. J.B. Pritzker on Thursday forced out three members of the Illinois Racing Board for allegedly making illegal political contributions, leaving the state’s horse racing regulatory agency in flux as the struggling industry jockeys to get back on track with help from a massive gambling expansion. The abrupt resignations of Racing Board Chairman Jeffrey Brincat and commissioners Edgar Ramirez and Gregory Sronce were the result of apparent violations of a new provision included in the gaming package signed into law by Pritzker last summer, which bars board members from giving money to politicians.