Newly elected U.S. Senator Cory Booker walks on stage to speak after winning a special election on October 16, 2013 in Newark, New Jersey. Booker, the current mayor of Newark, defeated Republican Steve Lonegan to replace Frank Lautenberg, who died in June. By Spencer Platt/Getty Images. Booker becomes the first African-American elected to the US Senate since Barack Obama and will join a very short list of black Senators in American history.