 and serve as a president of the united states the constitution limits a president to serving two full terms and so uh because of obama served two obama uh served two full terms he couldn't come back and the challenge that you have is that because the constitution reads that if the president cannot fulfill his or her duties then a vice president would step into the role you could not allow for the person the president it's believed that you couldn't allow for the president to turn around and be vice president because