Mitt Romney campaigned for John Kasich in Ohio last week. He did it because he is supporting the strongest anti-Trump candidate in various races. This week, however, Romney is encouraging Utahans to vote for Ted Cruz.
Kasich, whose only hope for the nomination lies in some bizarre Rube Goldberg scheme where Cruz and Trump delegates vote for him at the RNC convention, being the petty little man that he is, is not happy. So he's running an ad showing Romney stumping for him in Ohio in Utah.
This sort of smacks of desperation leavened with dishonesty.