Did you see Obama's as well? I actually found McCain's funnier and was surprised to see that McCain actually showed much better comedic timing than Obama did. Both were quite gracious to one another, too, despite the digs at each other -- which was refreshing to me.
This subject is such a hornet's nest that I'm somewhat loath to take a stand. I will say that the majority of the mainstream, "accepted" climate indicators do NOT predict global cooling in the near future. (There are some bits of data, largely related to solar cycles, that do foretell cooling, but this is a highly contentious area of climate prediction whose relation to global warming/cooling is generally not accepted by the majority of mainstream climate scientists.) That being said, there certainly are periods of global warming and cooling that are naturally part of the earth's climate.