"A More Perfect Union" izita rehurukuro yakapiwa naSenator Barack Obama musi waMarch 18, 2008 panguva yemakwikwi ekuda kugadzwa kweMutungamiri weDemocratic Party. Achitaura pamberi pevateereri paNational Constitution Center muPhiladelphia, Obama akanga achipindura kukwira kwakanga kwaita ngwariro pamashoko anopokanwa akanga ataurwa naReverend Jeremiah Wright, aimbova mufundisi wake uye, kusvikira nguva pfupi hurukuro isati yatanga, akanga achitsigirawo mushandirapamwe wake
. Obama akaronga mhinduro yake maererano nenyaya huru yerudzi muUnited States. Musoro wehurukuro yacho wakatorwa muSumo yeBumbiro reMutemo reUnited States.