Republicans had headlines like this when Biden won. This is a bad look for democrats if they call foul the same way when they lose. There's been lots of analysis on the difference in the polls and outcome. From my perspective, identity politics has created an atmosphere where having an opinion that is different from the allowed one gets you removed from sites or ostracized. In that same way it disincentivizes people to offer their real thoughts in polls. Say what you will, but I think the over-reach on trans and racism agendas (you're x-phobic if you don't completely validate what I personally think or project into you) meant that plenty of people decided to pick trump while quietly saying nothing or the opposite, since those topics are cancelable offenses in the public space.
I really hope this doesn't go the route of conspiracy theories and not actually realizing that all the Dems need to do is focus on being stable and not playing identity politics at the legal level. I'm already stuck with trump for 4 years. I don't need it for longer because they lean to hard on extremist points since they know they get a forever base from that.