You edited your post to show you didn't choose them, but found them elsewhere. Fair enough.
I would argue they are meaningless. There is one thing that make them comparable - distance of time to election. There are about a million things that make them completely different. Polls generally don't work the way he's trying to use them and I suspect he would admit that if pressed.
Polls are good for measuring longitudinal change in opinion over time. Less so as comparisons of different people/things at different times.