Mezue ahịrịokwu na-esonụ: Truman ghọrọ onyeisi ala n'April 1945 mgbe Franklin D. Roosevelt nwụsịrị. N'imeri mgbalị ndị a na-eme iji wepụ ya na tiketi ahụ, Truman meriri nhọpụta onye isi ala na 1948 Democratic National Convention. Mkpokọta ikike ụmụ amaala nke mgbakọ Democratic mere ka ọtụtụ ndị nnọchi anya ndịda pụọ, bụ ndị wepụtara tiketi "Dixiecrat" nke atọ nke Gọvanọ Strom Thurmond nke South Carolina duziri. Ndi Dixiecrats nwere olile anya inweta ntuli aka ndi nhoputa ndi ochichi iji mee ka ntuli aka ndi ozo di na ulo ndi nnochite anya, ebe ha nwere ike iwepu ihe n'aka ma Dewey ma obu Truman n'ihi nkwado ha. Truman chekwara ihe ịma aka site n'òtù ya n'ụdị nke onye bụbu osote onye isi ala Henry A. Wallace, onye malitere Progressive Party ma maa aka na ndọrọ ndọrọ ọchịchị nke Truman nke agha Cold War. Dewey, onye bụ onye ndu nke akụkụ ọwụwa anyanwụ nke otu ya ma bụrụ onye a họpụtara ịbụ onye isi ala Republican na 1944, meriri Senator Robert A. Taft na ndị ọzọ na-ama ya aka na ntuli aka ahụ.
Nnọkọ Mgbakọ Mba Nile nke Ndị Ọchịchị Republican nke 1948.