Mitt Romney was not attacked for not representing conservative/republican values, but for going against a mob/cult (of personality). That is as "cancelling" as it gets, regardless if it leads to him being voted out in Utah or not.
He is not ostracized in the way I would consider it. As far as I know Republicans still work with him, are willing to let him sponsor bills, etc. My understanding is he is still invited to Republican lunches as well.
I think we are working with two different understandings of cancellation. He will almost certainly lose his next election though.
>he was good enough to be president
Well not good enough since he lost to Obama. Just because you win a primary doesn't mean the majority actually supports you.
>so something else must have changed.
I think people forgot what his views were. People have nostalgia and remembered they thought he was better than Obama which turned him into a more mainstream conservative in their mind. I think there are other things at play like Romney being a Morman and also having name recognition.
My point was specifically that this wasn't the case here. Maybe you misread a negative in my comment.
If you say it's not cancel culture when a majority of people change their mind about someone, then you're saying that almost by definition cancelling is when a small minority of people have the power to deplatform someone who missteps. So, it's not accurate to say that "the left is ok with cancel culture" (for instance) since only a small group of people are going it who are not representative of the larger population.