In the sixty-two years between Washington’s election and the Compromise of 1850, for example, slaveholders controlled the presidency for fifty years, the Speaker’s chair for forty-one years, and the chairmanship of House Ways and Means [the most important committee] for forty-two years. The only men to be reelected president —Washington, Jefferson, Madison, Monroe, and Jackson—were all slaveholders. The men who sat in the Speaker’s chair the longest—Henry Clay, Andrew Stevenson, and Nathaniel Macon—were slaveholders. Eighteen out of thirty-one Supreme Court justices were slaveholders.
Historian Leonard Richards quoted by Garry Wills