Florida’s senior senator, often described as one of the luckiest politicians alive, won three terms as a Democrat in the U.S. Senate seemingly without breaking a sweat, and for good reason: He faced one weak opponent after another. After 46 years in public office, he finally met his match in Gov. Rick Scott, whose vast personal fortune, trademark aggressiveness and single-minded discipline has proven to be just enough to produce an excruciatingly narrow victory — Scott’s third, close statewide win in eight years.