victory was the fifth consecutive presidential win for the Democratic Party, the longest winning streak for the Democrats, and the longest for either party since the 1880 election. With simultaneous success in the 1948 congressional elections, the Democrats regained control of both houses of Congress, which they had lost in 1946. Thus, Truman's election confirmed the Democratic Party's status as the nation's majority party. This was the last presidential election before the ratification of the Twenty-second Amendment in 1951, limiting the number of times a person may be elected president. Nominations Democratic Party nomination On July 12, the Democratic National Convention convened in Philadelphia in the same arena where the Republicans had met a few weeks earlier. Spirits were low; the Republicans had taken control of both houses of the United States Congress and a majority of state governorships during the 1946 mid-term elections, and the public opinion polls showed Truman trailing Republican nominee Dewey, sometimes by double digits. Furthermore, some liberal Democrats had joined Henry A. Wallace's new Progressive Party, and party leaders feared that Wallace would take enough votes from Truman to give the large Northern and Midwestern states to the Republicans. Conservatives dominated the party in the South, and they were angered by the growing voice of labor unions and black voters in the party outside the South. The hope that Truman would reverse course faded when he vetoed the Taft-Hartley Law, which sought to reduce the power of labor unions. Congress voted to override Truman's veto, and the Taft-Hartley Law went into effect on June 23, 1947. Finally, Truman's appointment of a liberal civil rights commission convinced Southern conservatives that to re-establish their voice they had to threaten third-party action to defeat Truman in 1948. Truman was aware of his unpopularity. In July 1947, he privately offered to be Eisenhower's running mate on the Democratic ticket if MacArthur won the Republican nomination, an offer which Eisenhower declined. Truman's offer to Eisenhower did not become public knowledge during the campaign. As a result of Truman's low standing in the polls, several Democratic party bosses began working to "dump" Truman and nominate a more popular candidate. Among the leaders of this movement were Jacob Arvey, the head of the powerful Cook County (Chicago) Democratic organization; Frank Hague, the boss of New Jersey; James Roosevelt, the eldest son of former President Franklin D. Roosevelt; and liberal Senator Claude Pepper