The Contenders: 16 for '16TV Show

Despite vastly different backgrounds, George W. Bush and Barack Obama, two of the best campaigners in presidential history, both won two-term presidencies in the 21st century. Bush won a hotly contested Republican primary before narrowly beating Democrat Al Gore in 2000. Barack Obama went from relative obscurity to a history-making campaign in just a few years, riding a wave of hope and change to the White House.