I imagine if Kaine had retained composure he might have won this debate. He has had a lot of strong points. The constant interrupting and the way he has interrupted have been distracting and put him in the image of being nervous and not in command of the debate.
Pence has not really made any strong points at all, but by retaining composure, he has made the appearence that he is on top of the debate. This was especially so at the beginning.
It will be interesting to see how this will be spun by the media and the impressesion that prevails on twitter and other social media.
Kaine has brought up the key points in this campaign--taxes, immigration, Donald's insults and discrimination toward women, Hispanics, and Muslims--and nothing Pence has said will quell voters' opinions on those. Pence has maintained his composure, which is a plus, but nothing he has said will undo Hillary's massive gains since the first debate.
Maintaining composure should not be underestimated.