Pedzisa mutsara unotevera: Maonero ezvematongerwe enyika aDuvall anorondedzerwa zvakasiyana-siyana seane rusununguko kana kuti anochengetedza. Iye pachake akakokwa kuRepublican President George W. Bush's inauguration muna 2001. MunaGunyana 2007, akazivisa rutsigiro rwake kumumiriri weRepublican Mutungamiri Rudy Giuliani. Duvall akashanda pasi paGOP's
2008 musangano wenyika uye, maererano naAugust 29, 2008, MSNBC chinyorwa, Duvall akataura mazhinji emavhidhiyo emusangano. MunaSeptember 2008, akaonekwa pachikuva paJohn McCain  Sarah Palin rally muNew Mexico.