Kammala wannan jumla: Tewes shi ne darektan jihar Iowa na
Barack Obama ta 2008 yakin neman zaben shugaban kasa, kuma ya ci gaba bayan da Iowa caucus ya jagoranci Obama ta filin ayyukan a key jihohi kamar Nevada, Ohio da kuma Pennsylvania. A cewar Huffington Post, Tewes "ana ɗaukarsa a matsayin ɗaya daga cikin mafi ƙwarewar masu shirya siyasa a cikin ƙasar", kuma "ya kasance mai alhakin nasarar da Obama ya samu a Iowa".