U.S. President <a href="https://en.wikipedia.org/wiki/John_Tyler" id="mwdQ" rel="mw:WikiLink" title="John Tyler">John Tyler</a> is sworn in, two days after having become president upon <a href="https://en.wikipedia.org/wiki/William_Henry_Harrison" id="mwdg" rel="mw:WikiLink" title="William Henry Harrison">William Henry Harrison</a>'s death.