son Rockefeller to succeed him.↑ 4.0 4.1 4.2 Resigned.↑ Being the first vice president to assume the presidency, Tyler set a precedent that a vice president who assumes the office of president becomes a fully functioning president who has his own presidency, as opposed to just a caretaker president. His political opponents attempted to refer to him as "Acting President", but he refused to allow that. The Twenty-fifth Amendment to the United States Constitution put Tyler's precedent into the Constitution.↑ Former Democrat who ran for Vice President on Whig ticket. Clashed with Whig congressional leaders and was expelled from the Whig party in 1841.↑ 7.0 7.1 7.2 7.3 Assassinated.↑ 8.0 8.1 Abraham Lincoln and Andrew Johnson were, respectively, a Republican and a Democrat who ran on the National Union ticket in 1864.↑ Andrew Johnson did not identify with the two main parties while president and tried and failed to build a party of loyalists under the National Union label.