It should be in order starting with Obama's press secretary Jen Psaki. There have been a lot over the ten years and I forget some of them and have forgotten the order. It might also be helpful to point out what their actions were and how it failed. Most of the failures are just not following through. I used to post these on reddit to defuse libs hope for the daddy of the week who was "definitely gonna stop drumf this time" but kept getting 
and assurance that this time is different. Maybe people will take a good hard look at the list of a decade of failure at a moment where confidence in the system is at an all time low and it will change some minds finally. Libs love a good Gish Gallop. Too bad so many people had to get hurt in the process.
Here are a few off the top of my head:
Jen Psaki "rang the alarm bells about the incoming admin" (nobody did anything to put up guard rails)
The Epstein stuff (part 1) self explanatory.
Rachael Maddow: swore she had Trump's taxes finally, as if he just had a line item that said "crimes". Huge flop. Lots of people tuned in and it was nothing.
Robert Mueller: Russiagate investigation (flopped, basically exonerated trump in the court of Republican opinion)
Stormy Daniels: told scandalous details of Trump's private life and sued him
Lev Parnas: still really don't know what that was all about. Was he a snitch on his way to jail? Resulted in nothing
Jack Smith: attempted to prosecute Trump for... Stuff. Mishandling documents? (Failed to get anywhere, ran the clock out and was fired. Plus, Biden was caught doing the same shit)
Fauci: tried to point out how the pandemic was handled poorly. Handled it poorly himself
Joseph Robinette Biden: beat trump in an election only to hold the door for him to come back. No guard rails wee installed, and no prosecution of anyone from the previous admin. Carried on Trump's policies and even made some worse. Was a bit corrupt himself so it gave trump people ammo to be like "everyone does it". So much more, but that would be it's own post.
Merrick Garland: slow walked prosecution and ran the clock out. Libs were pissed! There were sure this was it™
Alnur Mussayev: started the "agent Krasnov" stuff with no evidence. Fizzled out.
The Epstein stuff (again)
Sunday morning"
yeah but that's (D)ifferent shit