The Iowa Racing and Gaming Commission is investigating a spate of pool manipulation incidents which seem to have occurred on three races run at Prairie Meadows in the last eight race days, the Thoroughbred Idea Foundation (TIF) said in a release Friday morning. Daily double pools on Sept. 4 (Races 2/3), Sept. 1 (Races 6/7) and Aug. 25 (Races 5/6) were subject to massive bets on combinations the manipulator(s) expected to lose. In each case, the bets were made in the final betting cycle when projected payouts for each combination...