I don't have time to write a manifesto several paragraphs, but I've had this thought percolating in my head for a while:
Prior to Trump and the MAGA politicians (those who were elected in 2016 or after) there was a bit of order in how things worked - seniority mattered. You had to put in the work and eventually you would get a turn at bigger and better opportunities. That could be a favored committee appointment in the House or Senate, or moving up from state legislatures to the House of Representatives, or taking a cabinet position, etc. It could even mean getting a chance at the White House - George H.W. Bush put in his time. Bob Dole put in his. John McCain put in his. Newt Gingrich, and so on, and so forth (even if they didn't make it out of the primaries). George W. Bush kind of jumped ahead in the line, going from governor to President with such a short career, but you could also view his election as a continuation of his dad's administration, and he was Governor of Texas.
And then along comes Donald Trump and MAGA. Trump was a long-time Democrat and didn't do shit in the past to deserve to jump to the front of the line other than have money and name recognition and say bad things out loud. Trump has a whole lot of people jump on his bandwagon. If you're an old-school Republican in Congress, toiling away for years in shitty committees, and putting in your time and then you watch all of these MAGA politicians like Marjorie Taylor Greene, Lauren Boebert, etc. come in with no background, no hard work, and they get committee assignments you wanted or get attention or campaign donations that you feel should have went your way, and you get these White House staffers who are telling you what to do, even though just a few years before they were still in college. You have Elon Musk and his DOGE bullshit wrecking things for your constituents and they are blaming you for his and Trump's fuckups.
You see all of these people in Trump's orbit who had not spent years and years of shaking hands at county fairs, going out to eat with campaign contributors that you loathe, cutting ribbons at the grand opening of a Piggly Wiggly in Bumfuck, Georgia, etc. and these people are jumping ahead of you in line. You're camped out in line for Whitesnake or Hall & Oates tickets for 12 hours and then 10 minutes before the tickets go on sale, these motherfuckers walk right past you and go to the head of the line and get the best seats in the house. And these people will destroy you at the drop of a hat if they think you are not loyal enough to them and Trump, even though nobody knew who the fuck they were 8 years ago. They don't give a fuck about you spending 12 years (or 20) in Congress working up to a committee assignment you coveted - they are going to give it out to whoever the Yankee Democrat-turned-Republican favors.
It has to really piss you off, especially when you realize that some of your political ambitions may not come to pass because the MAGA politicians have jumped ahead of you in line. Especially when you watch some of your longtime colleagues be shoved out of the House or Senate because they aren't loyal enough to the Yankee Democrat-turned-Republican.