Do vice-presidential selections issue?

.SHORTLY AFTER introducing his run for the Democratic nomination in 1960, John F. Kennedy claimed: “I do not recollect a single instance where a vice-presidential applicant contributed an appointing vote.” Still, the north-easterner picked Lyndon Johnson as his running-mate, really hoping that the legislator from Texas would certainly aid him in southern conditions. Johnson tore around the South in a train nicknamed the LBJ Express, coming to rallies in a ten-gallon hat to the strains of “The Yellow Flower of Texas”.

After he won, Kennedy acknowledged that “our company couldn’t have carried the South without Johnson”. That Johnson “delivered the South” is currently acquired understanding. However just how much distinction carry out vice-presidential selections actually create in elections?