How exactly is that possible in this day and age? The only other people/group with that much money to bribe politicians outside the mega-corporations would be real-estate right (which of course is where Trump came from)?
Alinsky talks about how the concept of tactics involves doing what you can with what you have, and in describing the power of the "Have-Nots", he says that activist groups that don't have money have to make up for it in flesh and blood. From this, he describes several principles that don't rely on money but do rely on cunning and-- very important--
organization.
Either base needs to be mobilized well enough to raise a populist candidate. Trump was a unique case in that he had enough in "fuck you" money to do his own thing, he seized upon the lowbrow woes of the Republican base without even having any party ties, and castrated the competition so quickly and furiously that they didn't even consider doing what the DNC did and just rig the primary against him-- in part because they expected 2016 to be a wash given the Hillary hype. Of course, the RNC is going to be wary of this post-Trump, but just being extremely charismatic, rich by independent means and willing to pander to the hoi polloi for the sake of your ego (rather than special interests for the sake of your wallet and re-election campaigns) is a difficult combo to get.
So, you need to order, invigorate, and mobilize the base to insist that the party does their bidding. Of course, "their bidding" needs to be conveyed rationally-- this is something that the masses can't do within themselves. In Trump's case, it's something every Republican decided not to do in the last four years because they were really banking on Trump, and the people able to either transmute the rabble into coherent policy suggestions or act upon said suggestions either weren't initially interested in the movement he led or were opportunistic banes of it (see: wignats).
Essentially, money isn't so much the issue-- consider that Trump prevailed over Clinton despite spending a magnitude less. The issue is firstly rousing enough people awake to hold their politicians to the fire (or primary them in favor of a politician they desire), and secondly getting them to do so in an effective and intelligible way. Given the actual allegiances of these parties as a whole (their special interests), this needs to happen on a substantial scale (
a lot of representatives and senators need to have their feet held to the fire in the same time period with unrelenting ferocity). If they choose to throw out a politician, they need to make sure that there's a line connecting the politician replacement and the will of the people in order to mitigate defection to the Swamp (making it clear that they can and will lose any favor they had with the community they ostensibly represent if they screw up). AOC belongs to one such organization, but she's also very vapid and the district she represents is second in safety to Pelosi's, so between that and the fact that she's rather isolated in influence ("the Squad" can't do jack against the might of the rest of the party, and any movement they're a part of is either not gaining traction elsewhere or rested on their laurels far too early) she seemingly was able to be overtaken by Washington politics.
It's inevitable that the revolutionaries of today will become the establishment of tomorrow if they succeed, but you
cannot allow your revolution to be assimilated into or tolerated by the establishment-- this is what happened with Trump's. It must overtake it wholly.