The 2008 presidential campaign of John McCain, the senior United States Senator from Arizona, was launched with an informal announcement on February 28, 2007 during a live taping of the Late Show with David Letterman, and formally launched at an event on April 25, 2007. His second candidacy for the Presidency of the United States, John McCain previously ran for his party's nomination in the 2000 primaries, losing to Governor George W. Bush of Texas. After winning a majority of delegates in the Republican primaries of 2008, on August 29, leading up to the convention, McCain selected Governor Sarah Palin of Alaska as his running mate for Vice President. Five days later, at the 2008 Republican National Convention, John McCain was formally selected as the Republican Party presidential nominee in the 2008 presidential election.