The 1934 Missouri Democratic Senate Primary made Harry S. Truman a candidate for national office almost by accident—and then showed how a local political organization could turn an unlikely choice into a decisive statewide victory. Truman won the nomination by 40,745 votes, but the campaign left a persistent question about agency: how much of the triumph belonged to the candidate, and how much to the Pendergast political machine that had put him forward and delivered an enormous margin in Jackson County.

An unexpected candidacy

In early May 1934, Truman was on a speaking tour and stopping in Warsaw, Missouri, when Jim Pendergast asked him to come to the Bothwell Hotel in Sedalia. The drive took about half an hour. In a corner of the hotel lobby, Jim Pendergast and James A. Aylward told Truman that Tom Pendergast wanted him to run for the United States Senate. Truman had not expected the proposal and was nearly speechless. Aylward assured him, “The Boss is 95 percent for you.” Truman asked, “What’s wrong with the other five percent?”

Tom Pendergast had not settled on Truman first. He had approached at least three other possibilities, all of whom declined. Jim Reed was asked largely as a courtesy; Joe Shannon said he was out of sympathy with the New Deal and preferred to remain in the House. Aylward, whom many considered a strong potential candidate, did not want to leave his family or law practice for Washington. When Jim Pendergast suggested Truman—a name that had not previously appeared on anyone’s list—Aylward supported the idea. Tom Pendergast remained skeptical, but the two men persisted until he agreed.

Truman said he needed time to think, but was told that running was necessary for the good of the party. He accepted, while making clear that he was broke. Aylward and Jim Pendergast each gave him $500 to get started. On May 14 the candidacy was announced. Before dawn that day, alone in a room at the Pickwick Hotel, Truman wrote that he was about to make the most momentous announcement of his life: only two weeks earlier, he had thought that a minor county office and something like a pension might be his future. The nomination marked a sudden reversal in his political prospects, though not the result of a plan he had long pursued.

A campaign shaped by the organization

Aylward, now chairman of the state committee, managed the campaign. At the opening rally in Columbia, Missouri, an estimated four thousand people gathered on the lawn before the Boone County Courthouse, near the University of Missouri campus. Busloads came from Kansas City, while a large contingent of state employees arrived from Jefferson City. A loud-speaking truck carried Truman’s speech, and an American Legion band played as the crowd assembled. The operation was organized to make a county campaign opening look like a major public occasion.

Truman’s opponents, Jacob L. “Tuck” Milligan and John J. “Jack” Cochran, were sitting Missouri congressmen, better known than he was and more experienced in Washington. Cochran was widely favored and had the support of the Igoe-Dickmann organization in St. Louis. Milligan had the backing of Senator Bennett Clark, whose support for him was seen as a challenge to Tom Pendergast’s influence and an attempt to secure another Senate seat for Clark. Both opponents made Truman’s connection to the Kansas City organization the central liability in his candidacy, presenting him as its machine candidate rather than an independent political figure.

That attack landed amid renewed public attention to the organization’s excesses. Violence in Kansas City’s municipal elections had left dozens injured and four dead. At Columbia, Truman answered by pointing out that Milligan and Cochran had themselves sought and received the organization’s endorsement in an earlier congressional race. He also accused Clark of seeking more power for himself. In later appearances, including stops in Saline County and Boonville, Truman tried to move the argument away from machine politics and toward the Depression. He declared his faith in the New Deal and presented the Democratic Party as a vehicle for ordinary people against concentrated wealth. A campaign placard on the loud-speaking truck read “A New Deal for Missouri.”

The campaign’s scale and texture varied across the state. Truman’s audiences were often only a few hundred people, quietly gathered in the shade of courthouse lawns while he spoke rapidly from the steps. They included courthouse regulars, older residents, and schoolboys on summer break. The reception was rarely demonstrative, but he generally left those who heard him feeling better about the occasion. The contrast between these neighborly appearances and the large, carefully assembled Columbia rally reflected the two elements of the campaign: Truman’s direct contact with local audiences and the organization’s capacity to coordinate people and resources across Missouri.

The vote and its geography

Milligan attacked the connection to the machine in especially vivid terms at a banquet in Kansas City, where he brought seven hundred people to their feet by condemning vote fraud. He joked that if Truman went to the Senate, he would develop calluses on his ears from listening to orders from his boss. By the final stretch, however, Milligan was falling behind, while Cochran and Truman appeared to be running neck and neck.

On August 7, Truman won the primary with 276,850 votes to Cochran’s 236,105; Milligan finished a distant third with 147,614. Truman did well among farmers, although Cochran carried as many counties as he did. The most consequential difference came in Jackson County: Truman received 137,000 votes there, nearly half of his statewide total. Two years earlier, Cochran had carried the county by 95,000 votes with Pendergast support. This time the organization backed Truman, and Cochran and Milligan together received only 11,000 votes in the county. In some Kansas City precincts, Cochran received no votes at all.

The result invited competing interpretations. The Kansas City Star called it a Pendergast triumph, while the St. Louis Post-Dispatch described Truman’s nomination as without significance. Contemporary accounts gave little credit to Truman personally; he expressed appreciation for what his friends had done. The figures make the role of organized support unmistakable, particularly in Jackson County, but the campaign had also required Truman to answer his opponents, address the Depression, and seek votes beyond the organization’s home base.

From nomination to Senate campaign

The fall general election was expected to be easy. Truman’s Republican opponent was incumbent Roscoe Conkling Patterson. Truman’s primary expenses had reached $12,286; his general-election expenses were only $785. After the nomination, Truman and Aylward made a quick visit to Washington to see Bennett Clark, the primary’s biggest loser. Clark, already looking toward his own reelection, was prepared to set aside his earlier attacks on Truman and the Kansas City organization and call Truman a good friend.

The nomination thus carried Truman from county office toward the Senate while binding his rise, in public perception, to the machine that had selected and supported him. Before he left for Washington, he told the Kansas City Elks Club that he hoped to keep his feet on the ground. The campaign had given him a larger political stage, but its most dramatic proof of strength was also its complication: the votes that made his victory overwhelming in Jackson County strengthened the claim that the victory belonged to the organization as much as to its nominee.