Hmmm... well, I have a ride down there already, from someone else. Not sure if you could come to, since Port Huron is a little out of the way. Talk to the "Homeschoolers for Ron Paul" director in Michigan (that's who I got a ride with).
If there's a way for you to come down toward Flint somehow that would probably work. My ride is coming from the north, so they'll probably be coming down 75. Port Huron, though, is like an hour off to the east on 69.