"Mitt Romney: Vote for John Kasich to stop Donald Trump in Ohio primary"
Here is Mitt Romney supporting Kasich a few days before attacking him.
http://www.cincinnati.com/story/news/politics/elections/2016/03/14/mitt-romney-vote-john-kasich-stop-donald-trump-ohio-primary/81776654/
ESTERVILLE "Who are you going to vote for?" Mitt Romney called.
"John Kasich!" the hometown crowd called back from the gym at Westerville Central High School.
The Ohio governor has lived here for decades, and these Columbus suburbanites have propelled him to the Statehouse, to Congress and to the governor's office, where he's been re-elected and enjoys the approval of a majority of Ohioans. But on Tuesday, he faces the election of his life: trying to eke out a win in his home state over billionaire Donald Trump, who surprisingly has emerged as the front-runner for the GOP nomination.
A win by Trump would add 66 delegates to his advantage over all his competitors. So Mitt Romney, the most recent GOP nominee and an outspoken Trump opponent, came to Ohio Monday to help boost Kasich's chances.