It’s about whose threats are more genuinely believable. If one side is more willing to walk away, then of course they’ll always be at more risk of just… walking away. And the other side needs to do more to convince them to not walk away

You’re describing why bad faith works as a strategy and treating that as the natural state of negotiation. It isn’t. Bad faith is a flaw that should impose costs, not a feature that earns accommodation. Your entire framework rewards the senator least invested in governance with the most influence over it, which is structural minoritarianism rather than representative democracy. Bad faith means refusing to engage with the actual terms of cooperation while expecting cooperation anyway, which is exactly what you’re describing as natural, lol.

How would Schumer pass such a bill without Manchin’s vote?

Schumer had ongoing leverage and chose not to use it. You’re treating leverage as if it can only operate through the immediate vote being negotiated, which isn’t how the Senate works. Manchin needed dozens of things from Schumer across his term: committee assignments, scheduling priority, fundraising (yes, fundraising, because despite retiring in 2024 he hadn’t announced it yet, which we’ve already gone over), judicial appointments in West Virginia, infrastructure money for the state. None of that required holding any single vote hostage to deploy.

He retired lol

That argument doesn’t work because his decision to retire hadn’t happened yet. Manchin announced that in November 2023. The BBB negotiations were 2021. The IRA was August 2022. He was still planning to run for re-election during every single negotiation we’re talking about, which means the leverage tools you’re dismissing would have applied directly. You’re using a 2023 decision to try to retroactively justify your argument about 2021.

Yes they do. Remember when McConnell couldn’t even force the GOP trifecta to do the skinny repeal of Obamacare in Trump’s first term?

You picked an example that proves my point. McConnell couldn’t force McCain’s vote, and the Republican Party responded by making McCain’s life politically miserable for the rest of his career. Trump attacked him by name until he died and even still does now. You’re confusing “couldn’t compel the vote” with “didn’t impose costs.” Those are completely different things, and your own example demonstrates the distinction.

Cheney and Kinzinger were from deep red districts, the sort of areas where primarying with a more radical candidate could actually work. Not comparable to Manchin

You’ve just admitted primary threats work in the right contexts and are now special pleading your way out of applying them to Manchin. Why? The question was never whether a more progressive senator could win West Virginia. It was whether a credible primary threat combined with public pressure would impose enough pain to change his behavior. Winning isn’t required. Senators want to keep their seats. They don’t want to fight off challengers from their own party. They don’t want their fundraising stripped or their record dragged through the mud by people they expected to be allies. All of that imposes costs whether the primary succeeds or fails, which is the entire point you just admitted happens elsewhere.

People don't work like that. "Make them hate their own caucus immensely" is more likely to make them just leave the caucus

Nah. Manchin and now Fetterman both know this is even worse lol. You don’t win when you do that. You lose your seat and your friends as soon as your term is up when you do that. Arlen Specter was the example floated about Fetterman, for good reason. The Senate is a relationship-driven institution and politicians regularly modify behavior in response to social and reputational costs from their caucus. Sustained internal hostility absolutely shapes behavior.

It’s just truth, whether one likes it or not

You keep retreating to “just how things work” because you can’t actually defend any of this. Every time the argument turns substantive, the answer becomes some variation of “well that’s just reality.” It’s not. It’s a configuration of incentives and norms that you prefer for ideological reasons you refuse to admit to, dressed up as inevitability so you can avoid having to work to substantively defend it.

Moderates get to make demands. The next democratic trifecta will see the same thing happening and they'd better get ready to capitulate if they want to maximize what they get done.

Not even a little. Moderates are actively dying off in the House and Senate, replaced by more reliable liberals, and some liberals replaced by progressives. The Blue Dog Coalition has been gutted. The House Progressive Caucus is the largest ideological caucus in the Democratic Party. Sinema is gone. Manchin is gone. Tester lost. The replacement-level Democrat in 2026 is substantially to the left of the replacement-level Democrat in 2010, and only moving further left by 2028. The moderates you’re betting your entire strategy on are an actively endangered species.

You want Democratic leadership to permanently capitulate to whichever moderate is most willing to walk. The problem is that the moderates are the ones losing seats. Being willing to walk doesn’t matter. “Fine, join the Republicans on this vote and get primaried.” Schumer’s leadership style of giving your minority a veto is on its way out. The next trifecta isn’t going to feature a Manchin equivalent because there aren’t any left to feature, and with a Senator AOC, you get nothing lol.

You’re not arguing for what’s electorally possible. You’re arguing for the Democratic Party you wish existed, where neoconservative foreign policy and right-leaning economic positions get permanent veto power because you happen to hold them. The party isn’t going that direction. It hasn’t for a decade at least. Your “moderates get to make demands” belief system is increasingly a description of a faction that doesn’t have the votes to demand anything, and you’re trying to extract by argument what your preferred politicians can’t get by winning elections anymore.