Popular Sovereignty is the idea that power comes from the People. Prior to the Constitution, Power came from a King, Queen, or special class (nobility or priests). Power was concentrated within one person. The idea that a common person had the same rights as one from a noble class was revolutionary and went against all the teachings of the day. The idea that common people had the power to overthrow a ruler for being corrupt was even more revolutionary. The Constitution was often referred to as the "Grand Experiment" because none of the Founding Fathers were sure if it would actually work.
Alexander Hamilton the man in the $10 bill, was the first U.S. Secretary of the Treasury and the Founding Father of the <em>Electoral College</em>, ratified at the election of Thomas Jefferson in 1800 tied with Aaron Burr, and Hamilton backed Jefferson, who won the presidency in the end.
The creators of the constitution didn't consider a system to allow voters to choose the president directly by popular vote. They didn't have much faith in people at that time, to pick the most qualified candidates. Therefore Hamilton motivated by this, proposed the Electoral College with an idea called “<em>not perfect, (but) at least excellent</em>” believing that idea would prevent such conjuncture.
Registration in some democracies for citizens & residents to check In with some central registry specifically for the purpose of being allowed to vote in elections