Just a few facts:
Ron Paul's name IS trademarked.
The internet is global.
The owners of the domain registered in Australia.
When anyone purchases and registers a domain name under a .com they agree to the conditions under ICANN and URDP which provides arbitration services which is WIPO. They are international agencies. The internet is international and domain disputes are handled through international agencies whether one agrees with the fact they exist or not. It's just the way it is.
Ron Paul is requesting his domain name only, which is trademarked. He is not requesting compensation for any profits the owners made and lived off of for the past 5 years they have used his name, nor is he requesting the mailing list.
For more information look up Domain Dispute Resolution Policy.