Conservatives who heard Donald Trump speak at the Western Conservative Summit yesterday told CBS4 “the event didn’t persuade them Trump is the right person to represent their political interests.”

Republicans made their uncertainty about Trump pretty clear during the April caucus, giving all 34 delegates to Sen. Ted Cruise. The now presumptive nominee skipped the state party convention and called the results “totally unfair,” The Denver Post reported at the time.

Dick Wadhams, the former head of Colorado’s Republican party, told CBS, “When you raise an issue like that not once, but a couple more times in a speech, I think that gives the impression that he cannot get it out of his mind. And I think he’s got to.”

“There is still a large body of conservatives who are still skeptical. They still want to know really who he is.”

As Colorado continues to grow more blue, the state’s nine electoral votes are looking more and more difficult for Trump to secure. FiveThirtyEight calculates his chances at 31.5 percent.