Efforts behind Illinois gambling expansion are losing ground at the Capitol as the plan’s new sponsor clashes with Gov. Pat Quinn, and Cook County Board President Toni Preckwinkle angles for a piece of the action. Rep. Robert Rita, who started shepherding the casino bill in the House last week, angrily disputed comments by the governor’s hand-picked chief gambling regulator, Aaron Jaffe, who suggested Chicago be taken out of the legislation. Rita suggested a separate vote on a Chicago casino would kill gambling expansion. “Is this (Jaffe’s) comments? Is this the governor? Where did these comments come from,” said Rita, D-Blue…