Democrats made similar claims about at least the 2000, 2004, and 2016 elections.
Trump's claims about election fraud and the sheer number of lawsuits are an escalation but it isn't a difference in kind.
Edited to add the following.
The child post correctly points out that I should have mentioned Trump's inciting a violent attempt to overthrow the government. This wasn't a deliberate omission.
On the left I see claims of disenfranchisement done through legal means, which whether you agree with or not is at least something real and concrete.
(https://en.wikipedia.org/wiki/2004_United_States_election_vo...) has a pretty good summary of the issues. The voting machine claims were a big deal at the time; I remember a lot of news coverage about that the voting machine companies were owned by Republicans.
I think the 2016 fraud claims were about Russian hacking (https://en.wikipedia.org/wiki/2016_United_States_presidentia...). (https://blogs.lse.ac.uk/usappblog/2018/09/11/many-democrats-...) claims that many Democrats questioned the 2016 election.
> On the left I see claims of disenfranchisement done through legal means, which whether you agree with or not is at least something real and concrete.
I agree that disenfranchisement is an issue and am in favor of federal voting standards and protecting the voting rights of convicted felons.
I haven’t seen anyone claiming Russian hacking changed the vote tallies of 2016. I remember the hacking “questions” being quite clear that the results of the election were not in question.