Favorability numbers are a useless data point these days.
Not necessarily - they're good for seeing if attacks are working on particular candidates or not. Vance may full well win simply because he's a Rep. But the story this entire cycle - from the summer to now - has been his unpopularity with voters.
People can and do vote for candidates that they don’t like (especially if they dislike both, which is where a lot of Ohio voters will find themselves (and in such a case, they tend to stick to their party)). I was looking back at the 2018 polls and Cordray was consistently hitting 48%, it’s quite clear that yet again lots of voters who disapprove of an Ohio Republican (hmmm where have we seen this before) will vote for one.