Martin Van Buren, our nation's 8th president, came after seven gentlemen who were titans (Washington, Adams, Jefferson, Madison, Monroe, Quincy Adams, Jackson) in the office and in our history. Referred to as the "little magician," he looked more like a Harry Potter character, standing at only 5 foot six inches.
He served from 1837-1841 and blocked the annexation of Texas because it assuredly would add to slave territory--and it might bring war with Mexico. Defeated by the Whigs in 1840 for reelection, he was an unsuccessful candidate for President on the Free Soil ticket in 1848. He died in 1862.