The one that I remember (I've seen it once) was when Anakin said "You're either with us, or against us," *which is a direct quote from George Bush in reference to nations harboring terrorists and their willingness to turn them over.
Honestly, I didn't even know there was debate about this, I noticed it myself...I can't help it, I'm a scientist so I pick up on these details. *
Again, I'm not making a huge deal about it, it's just an observation I thought was interesting. *So relax out there, I still loved the movie and was wondering if anyone else had picked up on this.