TUCSON - J.D. Hayworth, a former congressman and conservative AM radio host, nearly lost his voice this week delivering fiery attacks on John McCain, the Republican 2008 presidential nominee whom Hayworth accuses of betraying his party and getting too cozy with East Coast liberals. The four-term senator, says Hayworth, "is not the John McCain we knew." Hayworth’s assault from the right in a GOP primary has forced McCain to launch an early, aggressive defense of his seat. And today, McCain will attempt to enhance his conservative bona fides by hosting the party’s new darling, US Senator Scott Brown of Massachusetts,...