A number of people have changed. Among them are Ronald Reagan changed and also Barry Goldwater prior to his death but in the wrong direction.
Ronald Reagan changed decades before he ran for the presidency. He didn't "claim" to have changed so he could appeal to conservatives during a campaign. He was conservative. Trump, a liberal, is not, nor has he changed. His "sorry conservatives" on the topic of socialized healthcare and his 2013 praising of gun-grabber Michael Bloomberg prove it.