Mandate My Ass.
Those were the opening words of a 1980's classic musical polemic B Movie written and performed by Gil Scott-Heron. Scott-Heron of course was referring to the 1980 election of Ronald Reagan over Jimmy Carter. Reagan carried every state except four and the popular vote 50.7% to Carter's 41%. But as Scott-Heron caustically points out, Reagan's plurality constituted less than 39% of registered voters and just about 25% of the total number of American's of voting age in 1980.
Voter participation in the U.S. is the lowest of any western democracy averaging just over 50% for presidential elections and voting fraud is a legitimate concern I would think that considering the fact that number of actual cases of voter fraud incidents are so infinitesimally small in real numbers that the greatest concern for a democracy would be the lack of active participation in the electoral process by a majority of the population, as was the case in 1996, or 63% in any off year Congressional election.
National Voter Turnout in Federal Elections: 1960
Voter Turnout in Presidential Elections
The Truth About Fraud: Analysis & Reports