Key Races to Follow in Tuesday's Primary Elections in Kentucky, Pennsylvania, and Florida.

Primary elections are being held in Kentucky, Pennsylvania, and Florida on Tuesday. The Kentucky governorship race is the most closely watched, with a dozen Republican candidates vying for the chance to take on Democratic incumbent Andy Beshear. Pennsylvania is also hosting primaries, including a special election for a state House seat that could shift the balance of the legislature's lower chamber. In Philadelphia, progressives are hoping to notch another win with mayoral candidate Helen Gym. In Florida, the race for mayor in Jacksonville is a significant test for Democrats.