I pretty much sealed a strongly pro-war republican today on Ron Paul by first bringing up the bill RP introduced on letters of marque and reprisals. This sort of underhand vigilantly approach to putting bounties on the heads of terrorists sits quite well with them.
After explaining how the process would work, I then introduced the guy to Ron Paul's position on the war in Iraq and why he takes that position. It really helps show that RP's anti-Iraq war stance does not reflect that he is a hippish pacifistic pussy that will be soft on terror. I would really recommend trying this when dealing with pro-war republicans.