He was previously a senator from Illinois.
Barack Obama
The current President of the US is Barack Obama who was a former congressman from the state of Illinois.
Before he became president, he was a US Senator from Illinois.
Most recently, he was the US Senator from Illinois.
The Junior Senator from Illinois and President Obama's succesor to that Senate Seat. He becomes the only African American in the US Senate. He is a former Illinois Comptroller and Illinois Attorney General.
The former French president with an art center named after him in Paris is François Mitterrand. The art center is called the Centre Pompidou, named after Georges Pompidou, who was also a former French president.
President Kenneth Kaunda was the first and former president.
The correct title for a former president of the United States is "former President."
Bill Clinton
The Democratic Party's nominee for U.S. President in both the 1952 election and the 1956 election was Adlai E. Stevenson II, the grandson of former U.S. Vice President Adlai E. Stevenson I. However, he never served in Congress. He was the Governor of Illinois when he was running in 1952. The only U.S. Senators from Illinois who ran for President were Stephan A. Douglas and Barack Obama.
No US president known as baby duck to my knowledge. A recent president of Haiti was called "Baby Doc".