John McCain campaigned for presidency in the 56th quadrennial election.
John McCain . He was the Republican nominee for the 2008 U.S. presidential election . Presidential nominee . A candidate for president of the United States who has been selected by the delegates of a political party at the party 's national convention ( also called a presidential nominating convention ) to be that party 's official candidate for the presidency . The United States presidential election of 2008 was the 56th quadrennial presidential election .