Former Kansas Sen. Bob Dole speaks during a campaign stop for Republican Sen. Pat Roberts at a mall Monday, Sept. 22, 2014, in Dodge City, Kan. (AP Photo/Charlie Riedel) ** FILE **
Republican Kansas Sen. Pat Roberts talks to supporters at the Johnson County Republican headquarters, Monday, Nov. 3, 2014, in Overland Park, Kan. Incumbent Roberts is locked in a tough contest with independent candidate Greg Orman in Tuesday's midterm election. (AP Photo/Charlie Riedel)
Kansas Gov. Sam Brownback (left) and Sen. Pat Roberts, both Kansas Republicans, are facing tough re-election bids that analysts say has more to do with candidate troubles than with dissatisfaction with the GOP. (Associated Press)
Independent U.S. Senate candidate Greg Orman is giving Sen. Pat Roberts, Kansas Republican, a run for his money, but tea party activists say Mr. Orman is "independent" in name only and the Mr. Roberts is the conservative choice. (Associated Press)
** FILE ** Senate Rules Committee member Sen. Ted Cruz, R-Texas, right, joined by the committee's ranking member Sen. Pat Roberts, R-Kansas, speaks on Capitol Hill in Washington, Wednesday, April 30, 2014. (AP Photo)