I’m not sure it’s possible without larger changes. While campaign finance reform (and reversing CU) is necessary, corporate media and the 2 corporate parties are really the firewall that guarantees that the left will never be able to organize an opposition party.
There are those who believe the only reasonable chance of effecting change is to infiltrate the Democratic party by running as a Democrat in hopes of gaining enough seats and power to be able to have a voice and shift the the Democratic party left.
Nobody is really sold on this idea, and they approach it with cautious optimism that some day there will be something other than 2 right-wing parties. Until then, however, people aren’t just sitting around. Activists and organizations are actively endorsing and canvassing for these candidates, while continuing their daily work.
The Bernie campaign gave the left hope back in 2016, but again witnessed the limitation of trying to go up against the weight of the corporate Democratic party. The stakes are too high not to try again, and I certainly hope it will work. But the blackout is real, and if you talk to people who get their information from tv, they really have no idea what is going on. It’s not promising.
And electoral politics is just a small part of the whole operation. Even if Bernie could be elected “organizer in chief”, it would still take people continuing to organize and demand actual change.
Short answer: I don’t know/it would likely take changes to our economic, media, and electoral system – the kind of changes we need to make anyway if we plan on surviving.