Qor qoraalka ku xiga faqradan - aragtida siyaasadeed ee Duvall waxaa si kala duwan loogu tilmaamaa mid xor ah ama mid muxaafid ah. Waxaa si shakhsi ah loogu casuumay caleemo saarka Madaxweynaha Jamhuuriga George W. Bush sanadkii 2001. Bishii Sebtember 2007, wuxuu ku dhawaaqay inuu taageersan yahay murashaxa Madaxweynaha Jamhuuriga ee Rudy Giuliani. Duvall wuxuu ka hadlay shirweynihii xisbiga GOP ee 2008
Sida laga soo xigtay MSNBC August 29, 2008, Duvall ayaa ka sheekeeyay badidooda fiidiyowyada shirweynaha. Bishii Sebtember 2008, wuxuu masraxa ka soo muuqday isu soo baxa John McCain iyo Sarah Palin ee New Mexico.