Polk's first mentor was Grundy, but in the legislature, Polk came increasingly to oppose him on such matters as land reform, and came to support the policies of Andrew Jackson, by then a military hero for his victory at the Battle of New Orleans (1815). Jackson was a family friend to both the Polks and the Childresses—there is evidence Sarah Polk and her siblings called him "Uncle Andrew"—and James Polk quickly came to support his presidential ambitions for 1824. When the Tennessee Legislature deadlocked on who to elect as U. S. senator in 1823 (until 1913, legislators, not the people, elected senators), Jackson's name was placed in nomination. Polk broke from his usual allies, casting his vote as a member of the state House of Representatives for the general in Jackson's victory. This boosted Jackson's presidential chances by giving him recent political experience[a] to match his military accomplishments. Thus began an alliance that would continue until Jackson's death early in Polk's presidency. Polk, though much of his political career, was known as "Young Hickory", based on the nickname for Jackson, "Old Hickory". Polk's political career was as dependent on Jackson as his nickname implied.