President William Howard Taft started the tradition of throwing out the ceremonial first pitch on April 14, 1910, at National Park in Washington before a game between the Washington Senators and Philadelphia Athletics. The manager of the Senators, Jimmy McAleer, asked fellow Ohio native Taft to throw from his stadium box, launching the tradition.
Left, President Taft, a portly right-hander, throws a weak lob to the great pitcher, Walter Johnson. Click through to see other presidents throw out the ceremonial first pitch.
Note: Some source information is derived from AP archives and http://www.baseball-almanac.com/Source: Photograph by Rogers Photo Archive/Getty Images
Presidential First Pitches