diehard (n.)

• ass
• bigot
• brawler
• bullethead
• conservationist
• conservative
• defendant
• disputant
• dissident
• dogmatist
• donkey
• fanatic
• fogy
• fundamentalist
• imperialist
• litigant
• maverick
• monarchist
• mossback
• mule
• naysayer
• negativist
• objector
• obstructionist
• old
• opposer
• plaintiff
• positivist
• protester
• purist
• quarreler
• reactionary
• resister
• right
• right-winger
• rightist
• royalist
• scrapper
• stick-in-the-mud
• stickler
• ultraconservative
• white
• wrangler