( CNN ) -- Call it a political `` fumble . '' Republican Sen. Pat Roberts , who 's fighting for his political survival against independent candidate Greg Orman , got a highly coveted endorsement last week from Kansas State football coach Bill Snyder , who appeared in a 30-second ad for Roberts . But days later Snyder apologized for appearing in the ad . `` I made a mistake , '' he said at a press conference Saturday after Kansas State 's football game against Oklahoma State . `` I 'm not going to delve into exactly how everything happened , but I made a mistake and I embarrassed the university and that 's my responsibility and that was my error . '' Polls give GOP momentum going into midterms . `` I 'm not going to speak to it anymore right now , but that 's my fault and nobody else 's , '' he added . Asked if he wanted the ad taken down , he said `` yes . '' Snyder did n't explain how he got involved with the ad . `` He is as good as it gets for the state of Kansas , '' Snyder said in the spot . Video for the ad was shot on Kansas State 's campus , according to the Topeka Capital-Journal . The Capital-Journal also reported that Kansas State President Kirk Schulz said Roberts ' campaign refused to grant the university 's request to have the ad taken down . Senate control hinges on turnout . CNN 's Steve Brusk and Jill Martin contributed to this report .
Kansas State football coach says appearing in an ad for Pat Roberts was a `` mistake '' Bill Snyder said he `` embarrassed the university '' but did n't explain why he regretted doing it .