Those of you who don't think there's any serious danger posed by the GOP's plans to contest the election because they failed last time don't actually remember what happened last time. Last time, Trump simply assumed that because Republican officials were involved in administering elections in swing states, they would rig the election for him. They had no legal strategy to speak of and had to scramble with Rudy and Sidney Powell and Lin Wood to try to come up with some shit they could throw at the wall after-the-fact. That is not what will happen this time.
This time, they're much better prepared and have quite literally replaced all of those people who didn't rig the election for Trump last time with people they trust to do so this time. That doesn't mean they can definitely rig it (see Js1's post noting the differences between 2020 and 2024), but the legal arguments they will make will have a much greater appearance of legitimacy and may give Trump judges enough pretext to fuck with the election and try to prevent the timely certification of the correct electors and throw it to the House. It's very much within the realm of possibility that they could fabricate enough smoke for this SCOTUS to issue an order enjoining the governors of say, Arizona and Pennsylvania from submitting electors. Just because SCOTUS refused to accept the harebrained insanity that was filed late and often in the wrong fucking courts by Trump's dipshit crew last time doesn't mean they won't try to steal the election when they think they have a more acceptable pretext for doing so. And their recent behavior makes it clear that they're more desperate to install a permanent Republican dictator now than they were in 2020, so if anything their bar for what is an acceptable pretext is likely lower this year than it was in 2020.
Dems need to not just sit around and wait for this to happen. They need to go on the offensive, both in terms of a public PR campaign making clear what the GOP intends to do and in terms of FBI investigations. Because an election official refusing to certify an election without a valid basis for doing so is almost certainly a federal crime and it needs to be made very fucking clear that anyone who does not faithfully carry out their duties will be prosecuted to the fullest extent of the law. And Democratic elected officials at the state and federal level need to speak out in a unified voice that SCOTUS doesn't have the last or only say on this.