WITH VIDEO: Tempers flared before a televised audience as Kentuckys GOP gubernatorial candidates traded barbs over bridge tolls, the Affordable Care Act and attacks from an outside group backing Republican Hal Heiner on cn|2 Pure Politics gubernatorial debate Tuesday. More often than not, Louisville investment manager Matt Bevin was in the midst of conflict, frequently needling Agriculture Commissioner James Comer and Louisville real estate developer Hal Heiner with four weeks until Republican voters pick their partys gubernatorial nominee.