We have mail in voting in Oregon. We have drop boxes. We even have a region of the state that is so ultra-Right-Wing, that some of their citizens would prefer to be part of Idaho. In the decade I have lived here we have had some pretty contentious elections. But, nobody has ever claimed that an election was "stolen," or "rigged," or alleged any large scale fraud related to mail in ballots. The Democratic Party areas tend to elect Democrats and the Republican areas elect Republicans.
I suspect the reason Republicans tend to believe the fantastic claims of the Tangerine Tyrant is that the left hemisphere of their brains dominate. These are the people who take things as they find them, and work with them. They are the businesspeople, builders and craftspeople. As a performer, as an avocation and sometimes side-job, I have observed that they make the best audiences. But, they tend to believe the story, beyoond its entertainment value. They loved John Wayne because he told them bigger than life stories that made them feel good about themselves. And, there is a lot to feel good about. If you have lived in Republican dominated communities, which I have done twice, you come to know them as hard working, home owning and tax paying citizens. They are generally not overtly racist, sexist or anti-Semites. That is why they have never championed or even tolerated the "White-Wing Movement," until the Tangerine Tyrant came along. As he is placed on an ice-floe and put out to sea over the next months, it will be interesting to see which faction emerges and how they deal with the "others."