No. 8 USC, coming off a convincing season-opening thrashing over Arkansas State, faces its second consecutive Sun Belt opponent when it hosts long-ago conference foe Idaho. Until the teams met in 2007, it had been nearly 80 years since the one-time Pacific Coast Conference rivals had tangled. USC has won all 8 of its meetings against the Vandals. It’s the second of 3 straight home games that opens Troy’s 2015 campaign, with Stanford up next to begin Pac-12 play. USC third-year QB Cody Kessler, a Heisman Trophy candidate who last fall had the most efficient passing season in Trojan history (69.