What two U.S. Presidents were elected to Congress after serving as President?

Andrew Johnson (December 29, 1808 – July 31, 1875) was the 17th president of the United States, serving from 1865 to 1869. The 16th vice president, he assumed the presidency following the assassination of Abraham Lincoln ... He did not win the 1868 Democratic presidential nomination and left office the following year.Johnson returned to Tennessee after his presidency and gained some vindication when he was elected to the Senate in 1875, making him the only former president to serve in the Senate.

John Quincy Adams (July 11, 1767–February 23, 1848) was the sixth president of the United States, serving from 1825 to 1829. He previously served as the eighth United States secretary of state from 1817 to 1825; minister to Great Britain, Prussia, and Russia; and senator for Massachusetts. After his presidency, Adams uniquely returned to Congress as a member of the lower house until his death in 1848 … The Democrats proved to be more effective political organizers, and Jackson soundly defeated Adams in the 1828 presidential election. After a brief retirement from public service, Adams won election to the U.S. House of Representatives in 1830 as a member of the Anti-Masonic Party. He remains the only former president to be elected to the chamber.