In 1944, FDR was running for his fourth and final election. He was starting to age rapidly, he would be dead in just 82 days from being sworn in to his fourth term. Henry Wallace had been FDR's VP from 1941-1945. At the 1944 Democratic Convention FDR would be forced in the name of party unity to leave Wallace off the ticket. Wallace had recently become a Democrat and some felt too recently. Wallace was more liberal than FDR and that also was a strike against him. Finally Wallace was a Theosophist, which lead many to think he wasn't christian and was just too whacky to become President.
Question: Why was the Junior Senator from the backwater of Missouri chosen as Henry Wallace's replacement? What had Harry Truman a former county Judge who had never graduated from college, achieved which made him favored to ascend to the Vice Presidents spot? What had earned Truman such great respect that he was the consensus candidate for this important job to a sickly President in a time of war?