The issue is not that the name is common and another person with the same name as Ron Paul has it. That's what seems to have happened to LisaWheeler, though, with LisaWheeler.com being owned by another individual with the same name.
RonPaul.com is not owned by anyone named Ron Paul. AND they are using it in direct relation to the Ron Paul that we all know, which establishes their use of the domain. They are using his name/brand/likeness/trademark and trying to sell it back to him.
Your domain might be your name, but not if someone who shares your name already has it.