I'm not gonna put this at face value, since I've heard Nate Silver say that in these kinds of polls, respondents might just pick the "pro-Trump" answer. It doesn't necessarily mean they would want to actually postpone the election.
This said, people who think it OK to postpone an election because their beloved leader might lose it fail to understand that that initiates dictatorships. Dictatorships either have no elections (like Qaddafi) or have rigged ones (like the Kim dynasty in North Korea)
Maybe we Americans have been utter naifs about politics because the political system served us so well for so long and successfully shielded most of us (blacks in the Jim Crow South obviously excepted) from the worst of political tendencies. Thus the likes of Senators Joseph R. McCarthy, Jesse Helms, and Governor Paul LePage didn't hurt us that badly.
That is over! People who believe the lies of the current President are capable of believing anything, including that the President with the most contempt ever for democratic norms exemplifies democracy in its purest and most wonderful form. Note well that such types as fascist butchers Benito Mussolini and Adolf Hitler, Marxist-Leninist butcher Josef Stalin and Mao Zedong, absurdist butcher Moammar Qaddafi, and Ba'athist butchers Hafez Assad and Saddam Hussein offered that their horrendous systems were the purest examples of democracy to have ever existed, especially in contrast to 'bourgeois' (hence, fake) democracy.
Yes, Donald Trump is as bourgeois as one could get except for his aesthetic values (he appeals to proles in part by expressing the vulgarity of people 'not corrupted by high-quality education'), but I can imagine him offering a government that represents economic interests based upon economic power as a 'true' democracy. That's how Mussolini's Corporate State operated in practice. Don't fool yourself; there are Americans who think that the right way to do politics.
The pollster had to choose some order of questions worth asking. One is whether voter fraud is commonplace (illegal aliens voting, people voting in multiple precincts, impersonators) and the other is some question that suggests a dead giveaway for potential support of a dictatorship.
It may be that where people are complacent about their political freedom (the USA) they are less scared of dictatorship than if they knew first hand about a dehumanizing regime. If you live in Chile or the Czech Republic, then you know about alternatives to democracy imply. I have seen stories of people in America saying that "this reminds me of what I remember in Cuba".
But don't be fooled. Dictatorship in America will be really ugly. Maybe not as bad as Nazi Germany or "Democratic Kampuchea". Imagine political life being reduced to the elementary-level discourse that we see from President Trump. That's how politics were in Fascist Italy. Consider that dictatorial regimes tend also to dredge up the worst demons in a nation's history. We have severe inequality, some of the most militaristic tendencies in the first century of American existence (a/k/a Manifest Destiny), mob violence in the form of lynchings, and some of the most vicious racism to have ever existed. To the extent that America was a liberal democracy American political culture could mute (if not moot) such.
But people would never be sent to internment camps for their ethnic origin, religion, or political beliefs? Think of the incarceration of Japanese-Americans in a time of fear. God help us should we be able to say "Andersonville, here we come!" Sure, that was "Confederate"... but I see lots of Confederate flags outside the South -- and they are not in use in re-enactments.
