About half of Republicans polled by Reuters/Ipsos said Trump “rightfully won” the election but had it stolen from him in systemic fraud favoring Biden, according to a survey conducted between Nov. 13 and 17. Just 29% of Republicans said Biden rightfully won. Other polls since the election have reported that an even higher proportion - up to 80% - of Republicans trust Trump’s baseless fraud narrative. [...] In Reuters interviews with 50 Trump voters, all said they believed the election was rigged or in some way illegitimate. Of those, 20 said they would consider accepting Biden as their president, but only in light of proof that the election was conducted fairly.
(The exact number in the Reuters/Ipsos poll was 52% of Republicans who said Trump "rightfully won"; the margin of error was 5%.)
So, given that some other elections (after the [in]famous 1876 one) were also fairly controversial, namely in 2000 but also the one of 1960, was a [near] majority on the losing side claiming that the election was stolen or illegitimately won by the other side in the aftermath of such other controversial US presidential elections?