"none of them would actually have implemented it, except the only one with a history of going against party and lobby"

Why would the person with few allies and hostile relations with various power players be the one who could "actually" implement anything? Barack Obama had a senate majority that Bernie would have killed for in his hypothetical first term, but Obama still couldn't get his own party to even consider a public option. Things have changed compared to them, but not so much that any 51-seat senate majority could pass anything close to what Bernie calls for. It's beyond unrealistic to pretend otherwise.

Because the presidency is vastly more powerful than what you think. Obama could have pulled an FDR, or a Trump, and shifted the party very hard, but didn't. It's quite simple: you go to your opponent, you tell him that if he doesn't follow the whip you will use your vast reach to get him primaried, threaten to modify the rules of the DNC, hell, drum up support for a general strike. Threaten to slash the military budget, threaten to cancel a defence program, or to stop shale oil subsidies, play politics. But for some reason, from FDR onwards, no one plays politics except to concede towards the right. Literally no one in power. The platform of the Democratic Party has become "Let's be Republican-lite in order to win those elusive moderate independent" that for some reason seem to shift more and more towards the right for every single election cycle for the last 40 years, almost as if they were illusory or weren't as ideologically unmovable as asserted.

And it's total bullshit that the Democratic Party wouldn't consider a public option. The Republican Party was considering a public option.

You're saying that even with a Senate majority, Obama couldn't get his own party to consider public option, while also arguing that through candidates that are "far to the left" of Obama (except Bernie Sanders apparently), we can achieve the kind of structural economic change that people who support Bernie Sanders want. Seems a bit contradictory to me.

> but ended up compromising with Republicans for some absurd reason as he held both the house and senate

My memory is a bit fuzzy on this, but didn't he also have to compromise with the (relatively) right-leaning wing of the Democratic party?

Did Trump have to compromise with the left wing of the Republican Party? Did Biden have to compromise with the left wing of the Democratic Party? No, because of the implicit threat of being primaried, or for the party to be shifted. Which Obama did not even threaten, but all others presidents did (towards the right).

He also openly compomised in the name of "bipartisanship" multiple times despite it being uneeded.

The only thing that comes close to a left wing part of the Republican Party is Sue Collins, who is always very sorry and disappointed but eventually toes the party line.

Compared to Trump, roughly half of the Republican party is to his left by varying magnitudes. Obamacare, for example, was originally a Republican proposal.

But yes, the entire Republican party line eventually toes the party line. Same for the Democratic party, as long as the party line strengthens the class interests of the elite.

I didn't believe even Sanders would do that. That's why I supported Gabbard. She wasn't as strong on the economics, but I actually believed she would try to rein in the military-industrial complex, which is an indisputable blight upon humanity and which Sanders never discusses.