Former Florida Gov. Jeb Bush's experience in the 2016 Republican presidential primary was apparently enough to make him swear off ever running for political office again. While speaking Thursday at Texas A&M University, where he's spending two weeks teaching a course about governors, Bush admitted that he thinks 2016 was his best — and only — shot at making his presidential dreams a reality. "I unraveled everything I was doing to prepare for this — you don't do that lightly," Bush said. "I just think this was my chance." But Bush swears he's doing okay in spite of his loss....