AUBURN, Ala. -- Alabama’s Republican primary for the U.S. Senate seat being vacated by retiring U.S. Sen. Richard Shelby has become a bitter high-dollar contest with the three strongest contenders jockeying for the nomination. The leading candidates are U.S. Rep. Mo Brooks who won — and then lost — former President Donald Trump’s backing in the race; Katie Boyd Britt, the former leader of Business Council of Alabama and Shelby’s former chief of staff; and Mike Durant, an aerospace company owner best known as the helicopter pilot whose capture during a U.S. military mission in Somalia was chronicled in the...