In case there was any doubt, Kansas Republican Party leaders are backing U.S. Sen. Sam Brownback for governor.

On Thursday, the Brownback campaign issued a news release saying former U.S. Sen. Bob Dole and current U.S. Sen. Pat Roberts would serve as national co-chairmen for Brownback’s run for governor.

Brownback’s campaign also announced that U.S. Reps. Jerry Moran, Todd Tiahrt, Lynn Jenkins and former state senator Nick Jordan, all Republicans, would serve as his congressional district co-chairs.

On Monday, Secretary of State Ron Thornburgh announced he was dropping out of contention for the Republican Party nomination, leaving Brownback as the only candidate, so far, in the 2010 race.