Q70. "Can a President, after serving his/her term, run for Congress or the Senate?"
A. There's nothing that says you cannot. I think such a thing would have been more likely earlier in U.S. history - presidents nowadays enjoy a career of being former presidents until they die. In 1830, John Q. Adams was elected to the House following his presidency and in 1874, Andrew Johnson was elected to the Senate following his. In 1921, William Taft was appointed Chief Justice of the Supreme Court by Harding.