"A new super PAC called the Smoky Mountain Values PAC filed with the Federal Election Commission this week. The PAC is solely devoted to keeping Marsha Blackburn (R-07), frontrunner for the Republican Senate nomination, from being elected, said Kyle Tharp, one of the PAC's operators. The group plans to raise money online and is being run by 'a group of five young, 25-35 year old current and former Tennesseans' working on a volunteer basis, Tharp said in an email, adding that most of the operators have worked in Democratic politics. Tharp declined to detail the PAC's spending plans but said that 'it won't be insignificant.'" (Politico)
On the Democratic side, former Gov. Phil Bredesen (D) is running.