requested the resignation of all other cabinet officers except one. Van Buren instigated the procedure as a means of removing Calhoun supporters from the Cabinet. Calhoun further aggravated Jackson in the summer of 1831 when he issued his "Fort Hill Letter," in which he outlined the constitutional basis for a state's ability to nullify an act of Congress. The final blow to the Jackson-Calhoun relationship came when Jackson nominated Van Buren to serve as Minister to Great Britain and the vote in the Senate ended in a tie, which Calhoun broke by voting against confirmation on January 25, 1832. In January it was not clear who the Democrats' candidates would be in the election later that year. Jackson had already been nominated by several state legislatures, following the pattern in 1824 and 1828, but he worried that the various state parties would not unite on a vice-presidential nominee. As a result, the Democratic Party followed the pattern of the opposition and called a national convention. The 1832 Democratic National Convention, the Democratic Party's first, was held in the Athenaeum in Baltimore (the same venue as the two opposition parties) from May 21 to May 23, 1832. Several decisions were made at the convention. On the first day, a committee was appointed to provide a list of delegates from each state. This committee, later called the Credentials Committee, reported that all states were represented. Delegates were present from the District of Columbia, and on the first contested roll call vote in convention history, the convention voted 126–153 to deprive the District of Columbia of its voting rights in the convention. The Rules Committee gave a brief report that established several other customs. Each state was allotted as many votes as it had presidential electors; several states were overrepresented and many were underrepresented. Second, balloting was taken by states and not by individual delegates. Third, two-thirds of the delegates would have to support a candidate for nomination, a measure intended to reduce sectional strife. The fourth rule, which banned nomination speeches, was the only one the party quickly abandoned. No roll call vote was taken to nominate Jackson for a second term. Instead, the convention passed a resolution stating that "we most cordially concur in the repeated nominations which he has received in various parts of the union." Martin Van Buren was nominated for vice president on the first ballot, receiving 208