.SHORTLY AFTER announcing his run for the Democratic nomination in 1960, John F. Kennedy claimed: "I do not recollect a solitary instance where a vice-presidential prospect contributed an electoral vote." Still, the north-easterner selected Lyndon Johnson as his running-mate, hoping that the politician from Texas would aid him in southern states. Johnson tore around the South in a train nicknamed the LBJ Express, getting to rallies in a ten-gallon hat to the pressures of "The Yellow Rose of Texas". After he gained, Kennedy admitted that "our experts could not have actually carried the South without Johnson". That Johnson "supplied the South" is actually currently received understanding. But how much variation perform vice-presidential picks in fact create in vote-castings?