A majority typically refers to more than 50% of the total votes or participants, while a supermajority requires a higher threshold, often set at two-thirds or three-fourths of the votes or participants. Supermajority requirements are usually used for important decisions that require broader consensus among members or stakeholders.

A supermajority (2/3) in both houses of Congress.

Currently, the Islamist Freedom and Justice Party (AKP) has a supermajority of seats in the Turkish Parliament.

In the United States, a constitutional amendment must receive two-thirds of the votes in Congress.

Lyndon Johnson 1965

Nope, It was Jimmy Carter 1977