At the 1948 Democratic National Convention, Truman attempted to unify the party with a vague civil rights plank in the party platform. His intention was to assuage the internal conflicts between the northern and southern wings of his party. Events overtook his efforts. A sharp address given by Mayor Hubert Humphrey of Minneapolis—as well as the local political interests of a number of urban bosses—convinced the convention to adopt a stronger civil rights plank, which Truman approved wholeheartedly. All of Alabama's delegates, and a portion of Mississippi's, walked out of the convention in protest. Unfazed, Truman delivered an aggressive acceptance speech attacking the 80th Congress, which Truman called the "Do Nothing Congress," and promising to win the election and "make these Republicans like it."