John Tyler, Jr. (March 29, 1790-January 18, 1862) was the tenth (1841-1845) President of the United States. A long-time Democrat-Republican, he was elected Vice President on the Whig ticket and on becoming president in 1841, broke with that party. His term as Vice President began on March 4, 1841 and one month later, on April 4, incumbent President William Henry Harrison died of what is today believed to have been viral pneumonia. Harrison's death left Tyler, the federal government, and the American nation briefly confused on the process of succession. Opposition members in Congress argued for an acting caretaker that would continue to use only the title Vice President. The act of taking over as official president, rather than as acting president, came from the influence of the Harrison cabinet and some members of Congress. Members of Harrison's cabinet feared an acting leader would compromise the ability to successfully run the country.