Senate Republican leader Mitch McConnell speaks to supporters Saturday at the Tanglewood Farms Restaurant in Franklin, Ky. McConnell faces Tea Party challenger Matt Bevin and several other lesser-known candidates in Tuesday's GOP primary. Timothy D. Easley/AP hide caption

itoggle caption Timothy D. Easley/AP

Oregon Republican Senate candidate Monica Wehby, right, talks to supporter Marvin Hausman in Lake Oswego, Ore. Wehby has drawn national attention and money in her effort to win her party's nomination. Jonathan J. Cooper/AP hide caption

itoggle caption Jonathan J. Cooper/AP

Lt. Gov. John Walsh defending himself in Helena, Mont., on Jan. 26 against reports that he was reprimanded by the U.S. Army in 2010 for using his position as Montana adjutant general to solicit National Guard memberships to a private organization. Matt Volz/AP hide caption

itoggle caption Matt Volz/AP