No, the US distribution of political beliefs is not a unidimensional center-weighted distribution. More independents are either extremists outside the main parties on the main axis between the parties or sitting equally far off on axes orthogonal to that axis than are centrists.
And most centrists are in the neoliberal capitalist faction of one or the other for the major parties.
Not in any meaningful sense; largely for related limits to those discussed upthread for general centrism: research on voting behavior that has shown those who identify as independents are not particular independent, and contain an identifiable major subset as reliably partisan as those who identify with a major party.
If by “average, non-partisan belief” you simply mean the belief of the average person who doesn't identify with a major party, then, sure, you will have defined it such that independents are key. But this isn't useful information.
There is no such thing as apolitical observers.
Otherwise, I see the extended "election fraud" campaign as an excuse to squeeze out more money for Trump (bad), generate emotional support for the Georgia election (good), and help a guy in Texas get a pardon (lol).
I realize how what I wrote could be construed saying D's support the claim, especially if you presume I'm some kind of partisan hack trying to troll you. In fact, what I was emphasizing (poorly) was that the population sampled from which has one third of support includes Democrats and Independents, since I would have found one third of just Republicans believing there was widespread fraud to be somewhat surprising. I should have written "sampled from a population that includes Democrats and Independents" - I'd like to assume everything else I've written in this thread is evidence I'm not trying to trick anyone or score points. I am genuinely concerned at the level of dismissal, ridicule, and suppression of skeptics of the election, since the floor on this is a third of the country and history tells us what to expect when you leave that many feeling powerless to overcome a presumed deep injustice via speech, voting, and the legal system.