If true, that should be a deal-breaker. He could have held his nose to vote for Trump as we conservatives have been doing all these years when we voted for RINOs. Any "conservative" who voted for Hillary or Biden over Trump (or left it blank) is no conservative.
He did not vote for Trump, for which he has apologized. He had tweeted he might vote for an independent- NOT Hillary or Biden. https://dailycaller.com/2021/07/06/jd-vance-donald-trump-elections-2022-ohio/
I’ve read his book, Hillbilly Elegy and heard his interview on Tucker Carlson Today. I’m thinking I like him. He’s conservative, seems to have a lot of horse sense, and is a “thinking man.” Although he was not initially a supporter or Trump, he became a strong convert long before considering this Senate run. He’s certainly way better than Portman.