Vaguely. Was it about the Ethanol mandate and how he was opposed to it? (I can't see videos on this site for some reason.) Cruz might be effective on a one to one, but he likely would not have been able to replicate that feat across the entire state.
Cruz wanted to do away with the mandate and let the market decide. The immediate reaction to that by Governor Branstad was that "Cruz needed to be defeated, whatever it takes" (Branstad's son was a lobbyist at the time for the ethanol lobby.) Cruz started speaking with the farmers, and brought many around to his way of thinking: "Let the market decide", Cruz wasn't advocating a ban on ethanol in gasoline, just an end to the mandate.
Cruz apparently got the message across effectively, because he won the caucus.
The guy who came in second, who had heard Branstad's remarks and within a few hours proclaimed he would use the EPA to back the Ethanol Mandate to the fullest extent of the law, if not increase it, (which sent him down the list next to Jebbie for me), launched a media coordinated, well timed, and relentless smear campaign against the then frontrunner, one which did not end until after the election.
Well, he won. One of the seminal promises he made, he has made good on. We will have shitty gasoline for the foreseeable future.