The ideas stand on their own and many of them were not original to Dr. Paul. Leave his name off and focus on the philosophy. Without a name the person will be forced to think about the message and not the messenger.
You make a very good point. All the enthusiasm is worthless without votes. Bumper stickers, sign waves, Facebook "Likes" and t-shirts can't win an election.
I don't think it is okay. It's private property. Leave it alone. Better to go inside the mall and interact directly with the people rather than just leave them on the windshield. I think the ROI would be greater with personal interaction. Target people sitting in the rest areas on the couches...
Ron should bring a Newspaper
Ron should have a newspaper or nail clipper in his pocket for those times when they ignore him. Or maybe start reorganizing his wallet.