Harry S. Truman–Robert E. Hannegan political alliance

The alliance between Harry S. Truman and Robert E. Hannegan joined an urgent local campaign intervention to the high-stakes party maneuvering that made Truman the Democratic vice-presidential nominee in 1944. Hannegan’s work helped Truman through two precarious contests, but the relationship was not simply a story of personal loyalty: it depended on political organizers, party networks, and carefully timed moves whose consequences extended beyond either man.

The 1940 Campaign Breakthrough

In the final days before the 1940 Missouri Senate primary, Truman was running against Lloyd C. Stark and Maurice Milligan. Hannegan, a St. Louis political organizer who had until then been working for Stark, was still unknown to Truman. Bennett Clark brought the two men into alignment: with only two days remaining, Hannegan abruptly left Stark’s campaign and began working feverishly for Truman. The switch was sufficiently unexpected that its cause is not specified in the account; what is clear is its timing and impact. Truman later regarded it as the biggest break of the campaign.

Hannegan was not an inexperienced volunteer. A police chief’s son, he had been a star athlete at St. Louis University and briefly played semiprofessional baseball after law school. Since 1933 he had been deeply involved in Democratic politics, working within the tough political organization of the Dickmanns and eventually becoming city chairman. His move to Truman therefore connected the candidate to an established St. Louis political network at a moment when the primary was still unsettled.

The result was exceptionally close. Truman won by fewer than 8,000 votes out of 665,000 cast, and his margin over Stark in St. Louis was 8,411 votes. Hannegan had done last-minute work there after Clark’s intervention helped bring him across. Truman also carried Jackson County by 20,000 votes, despite the political damage that opponents believed association with the Pendergast organization would bring. The account credits Truman’s standing with voters, Jim Pendergast’s work, and what remained of the organization; it presents Hannegan’s St. Louis effort as one important element in a broader victory, not as its sole cause.

The episode established a striking asymmetry in Truman’s view of political loyalty. He saw Hannegan’s departure from Stark as an extraordinary service to his own campaign, and thereafter, the account says, Hannegan could do no wrong in Truman’s estimation. Yet Truman recognized that the same act, had it been directed against him, would have looked like outright betrayal. Their alliance thus began in a switch of allegiance whose meaning depended on who benefited from it.

From Campaign Ally to Party Insider

By the time of the 1944 convention, Hannegan had risen from local organizer to a national party figure. He had become Commissioner of Internal Revenue, was a close favorite of Roosevelt, and was in line to replace Frank Walker as chairman of the Democratic National Committee. The earlier campaign connection had become part of a much larger political relationship: Hannegan was now positioned among the people who could shape presidential access, party strategy, and the selection of a running mate.

That selection unfolded amid organized opposition to Henry A. Wallace. A small group of influential Democrats worked to weaken Wallace’s prospects and widen opposition to his renomination. Hannegan was among them. The group included party and political figures such as Ed Pauley, George E. Allen, and Edward J. Flynn; at the White House, Hannegan’s growing standing placed him close to Roosevelt’s political circle. The account describes this as a coordinated effort, not as a private scheme devised by Truman and Hannegan alone.

The contest initially seemed to favor James F. Byrnes. Truman had said he would nominate Byrnes, and Byrnes was reported to have secured more than 400 of the 589 votes required for nomination. When Flynn arrived in Chicago on the morning of July 18, Hannegan hurried him aside and said that the matter was settled in Byrnes’s favor. Flynn rejected that conclusion and demanded that the select committee meet again. In the ensuing discussion, Flynn insisted that Truman was the candidate agreed upon with Roosevelt. Hannegan was thus a crucial intermediary in a fast-changing process, but the account assigns the forceful argument in that meeting to Flynn and records Roosevelt’s eventual decision after Flynn put the committee members on the telephone with him.

Securing Truman’s Nomination

Roosevelt agreed that Truman should be nominated. Hannegan then carried the decision to Truman at his room in the Stevens Hotel and showed him a handwritten note attributed to the President. As Truman later remembered it, the note said, “Bob, it’s Truman, F.D.R.” Accounts differed about the note’s wording and circumstances: Truman recalled it as written on scratch paper and remained unsure that Roosevelt had written it. The episode reveals both Hannegan’s role as the bearer of decisive political information and Truman’s caution about treating that information as conclusive.

Truman subsequently went to the Royal Skyway hotel to release Byrnes from his promise of support. Byrnes accepted the explanation, though he said he would need to decide whether to remain in the race. The reversal had been accomplished not through a simple exchange between Truman and Hannegan, but through party deliberation, Flynn’s intervention, Roosevelt’s approval, and Hannegan’s communication of the outcome. Their alliance operated inside that network of influence rather than replacing it.

At the convention, Hannegan’s influence became visible in procedure as well as private consultation. Wallace led the first ballot with 429 votes to Truman’s 319. When the tally was completed after a long afternoon session, the convention unexpectedly proceeded to a second ballot at once rather than recessing for dinner. Because it remained the afternoon session, tickets for the planned evening meeting would not admit more Wallace supporters. The account identifies the move as a daring stroke by Hannegan.

The second ballot changed the balance. Edward J. Flynn delivered 74 New York votes to Truman, moving him into the lead; Alabama’s delegation then shifted to Truman, followed by South Carolina and other delegations. Wallace’s supporters continued to call for him from the galleries as the vote turned into a stampede. Hannegan’s procedural maneuver and Flynn’s delivery of New York’s votes were distinct contributions to the same result. Truman won the nomination through coordinated action, not through one decisive gesture by a single ally.

The Shape and Limits of the Alliance

Across the two campaigns, Hannegan repeatedly appears at moments when Truman’s political position could still turn: the last two days of the 1940 primary and the rapid recalculation of the 1944 nomination. In the first, he left Stark and supplied Truman with late campaign effort in St. Louis. In the second, his national party position put him inside the group negotiating over Roosevelt’s choice, and his command of convention procedure helped determine when the decisive second ballot occurred.

The record also distinguishes practical cooperation from the appearance of personal certainty. Truman’s enduring confidence in Hannegan followed the 1940 switch, yet in 1944 he questioned whether the note Hannegan showed him truly represented Roosevelt’s intent. That doubt did not erase the alliance; it shows that political trust could coexist with uncertainty about evidence and process. The relationship’s significance lies in that combination: Hannegan was a trusted campaign ally and increasingly powerful party operator, while Truman’s advancement depended on a broader coalition of organizers and decision-makers.