KINGSPORT — Former Tennessee Gov. Phil Bredesen visited what might be the reddest part of the state Thursday to sell his U.S. Senate candidacy to what looked like a who’s who of regional business leaders. “I’ve competed (in Northeast Tennessee) before,” Bredesen, a Democrat, former Nashville mayor, two-term governor and health care executive, said in an interview before addressing those business leaders at the Kingsport Chamber of Commerce.