On the expiration of his term, Van Buren returned to his estate of Lindenwald in Kinderhook. He continued to closely watch political developments, including the battle between Clay and President Tyler, who took office after Harrison's death in April 1841. Though undecided on another presidential run, Van Buren made several moves calculated to maintain his support, including a trip to the South and West during which he met with Jackson, former Speaker of the House James K. Polk, and others. President Tyler, James Buchanan, Levi Woodbury, and others loomed as potential challengers for the 1844 Democratic nomination, but it was Calhoun who posed the most formidable obstacle.