McCain, Christie campaign for Ohio GOP candidate

COLUMBUS — For­mer Repub­li­can pres­i­den­tial can­di­date John McCain offered his first U.S. Sen­ate endorse­ment of this elec­tion cycle, com­ing to Ohio to throw his sup­port behind fel­low mil­i­tary vet­eran Josh Man­del in a cam­paign heav­ily sup­ported by GOP national interests.