Yea, I think it's a good opportunity to find out what he's saying, let the kids watch, and then discuss the whole thing when the kids get home. At that point, whether you disagree or agree with what he says (or any part of it), you have a chance to sit down with your child and point out what you think is good, what isn't, and why. I think the "why" is the most important part. It's a chance for the kids to listen to a political leader and learn how to really analyze what they're saying. After all, they're going to need to be able to critically examine what other people tell them, especially those in positions of authority, so what better opportunity, especially if you have the speech to read ahead of time?