How many US senators went on to serve as POTUS
As of September 2021, nine U.S. senators have gone on to serve as President of the United States:
1. John Tyler - He served as a U.S. senator from Virginia from 1827 to 1836. Tyler was the tenth President of the United States and served from 1841 to 1845.
2. Franklin Pierce - A U.S. senator from New Hampshire from 1837 to 1842, Pierce became the fourteenth President of the United States and served from 1853 to 1857.
3. Andrew Johnson - Johnson's tenure as a U.S. senator from Tennessee lasted from 1857 to 1862. He became the seventeenth President of the United States following Abraham Lincoln's assassination in 1865.
4. Benjamin Harrison - Harrison served as a U.S. senator from Indiana from 1881 to 1887. He was subsequently elected as the twenty-third President of the United States and served from 1889 to 1893.
5. Warren G. Harding - Harding's term as a U.S. senator from Ohio began in 1915 and ended in 1921 when he became the twenty-ninth President of the United States. He served as president until his death in 1923.
6. Harry S. Truman - Truman served as a U.S. senator from Missouri from 1935 to 1945. Following Franklin D. Roosevelt's death, Truman became the thirty-third President of the United States and served from 1945 to 1953.
7. John F. Kennedy - Kennedy was a U.S. senator from Massachusetts from 1953 to 1960. He became the thirty-fifth President of the United States and served from 1961 until his assassination in 1963.
8. Lyndon B. Johnson - Johnson served as a U.S. senator from Texas from 1949 to 1961. Following Kennedy's assassination, he became the thirty-sixth President of the United States and served from 1963 to 1969.
9. Barack Obama - Obama served as a U.S. senator from Illinois from 2005 to 2008. He went on to become the forty-fourth President of the United States and served from 2009 to 2017.
Please note that this answer is accurate as of September 2021, and the list may change in the future as new Presidents are elected.