Alison Lundergan Grimes, the Democratic nominee for a Senate seat from Kentucky, talks with recent college graduate Lee Fowler during a May 17 campaign stop. Timothy D. Easley/AP hide caption

itoggle caption Timothy D. Easley/AP

Matt Bevin speaks during the 133rd Annual Fancy Farm Picnic in Fancy Farm, Ky., on Aug. 3. Bevin, a Louisville businessman, is challenging Sen. Mitch McConnell in the 2014 Republican Senate primary. Stephen Lance Dennee/AP hide caption

itoggle caption Stephen Lance Dennee/AP