Why does everyone say that no large scale voter fraud ever happened in the US? What about the presidential election of 1960? http://en.wikipedia.org/wiki/United

Why does everyone say that no large scale voter fraud ever happened in the US? What about the presidential election of 1960? http://en.wikipedia.org/wiki/United_States_presidential_election,_1960#Controversies http://en.wikipedia.org/wiki/United_States_presidential_elec... Even small scale fraud is enough to tip a close election, and I don't think too many people doubt that it does happen.