.SHORTLY AFTER introducing his run for the Democratic nomination in 1960, John F. Kennedy said: "I don't recollect a single situation where a vice-presidential prospect contributed a selecting vote." Still, the north-easterner picked Lyndon Johnson as his running-mate, wishing that the legislator coming from Texas would certainly help him in southern states. Johnson tore around the South in a learn nicknamed the LBJ Express, getting to rallies in a ten-gallon hat to the strains of "The Yellow Flower of Texas". After he succeeded, Kennedy accepted that "our team couldn't have held the South without Johnson". That Johnson "delivered the South" is actually now obtained wisdom. But how much distinction carry out vice-presidential picks really create in vote-castings?