You misread my post. It's not about any right for the elected to run again.
It's about the right of the electorate to choose him again.
The safeguards against dictatorship or any other illicit regime are inherent within the Constitution, and, philosophically, in the Declaration of Independence. That's how it stood until 1951 when 36 states ratified the 22nd Amendment.
Massachusetts and Oklahoma rejected the amendment, while five (Arizona, Kentucky, Rhode Island, Washington, and West Virginia) took no action - to this day. I say "to this day", because states routinely ratify amendments decades later, as a symbolic expression of support.