Another thought: I think Pence is doing a better job of executing his strategy, which is basically just to pirouette around any time he’d have to defend Trump. Whereas Kaine is swinging at a lot of pitches but not really following through. So judged on the basis, I’d give it to Pence, so far.
But I’m not sure that it’s a great strategy, because I think Pence’s nonresponsiveness could make for some good commercials for Clinton’s team in Brooklyn after the debate. So Pence could be setting himself up to win the actual debate but lose the post-debate debate.