Name some famous leaders of the party who became president?

Some famous leaders of political parties who became president include Franklin D. Roosevelt, a key figure in the Democratic Party, who served four terms in the U.S. presidency. Another notable example is Ronald Reagan, a former president of the Screen Actors Guild and a prominent leader of the Republican Party, who served as the 40th U.S. president. Additionally, Nelson Mandela, a leader of the African National Congress, became the first black president of South Africa after the end of apartheid.