Every time a third party candidate is proposed, the very fact that they are third party is used against them despite popular policy.
Proven, again, being the important distinction. Randos coming out of the woodwork every 4 years with swell official policies but no significant political administrative experience are not proven. Senators and governors are proven, they have a track record to look back on to see how effectively they actually implement their policies.
And to get progressive senators and governors, we need progressive mayors, county commissioners, city councilors, etc to seed those higher offices with proven political administrators. These third party candidates are shooting too high too fast, and spoiling the vote in the process.
In order to make it to the federal level, you must satisfy donors and wealthy Capitalists, and support their economic interests.
And how exactly do you plan to implement revolution? A coordinated, distributed grassroots network of leftists supporting a cause? Maybe try that. Build unions, vote for pro-union candidates at every opportunity, draft referendums to empower unions. You want to coordinate the proletariat? Do it.
You're pretending fascism is an idea that magically sprouts out of thin air, rather than a known phenomenon as a reaction to Capitalist failure.
No, I'm not addressing the source of fascism at all, I'm purely concerned with its popularity. You need to change material conditions, which requires power, which requires support. If you have majority support, you have the votes. If you don't, the revolution wouldn't work anyway.
The way you combat lots of money is lots of people. If you have the apparatus to lead a successful revolution by the majority, you have the apparatus to elect progressives. If you don't have it, you don't have a revolution by the majority, you have a revolution of the minority.
Even if you could elect progressives, they still can't enact change. The structure of the US is designed to uphold Capitalism, and as long as it is, it will act against any change to the status quo. The "democratic" apparatus is filtered and controlled by wealthy Capitalists, you yourself are arguing against progressive candidates in this election, pretending you'll ever change your tone.
Again, the answer is to stop trying to skip the groundwork. Get as many progressives into as many offices as possible as soon as possible. When Congress starts shifting progressive, suddenly a progressive president isn't so far fetched, and the general population is more likely to consider one. You can't jump straight to President.
Engage your community, flood your local community boards with progressives. Get the ones who do well elected to city council. Prove that your policies work in your city, then your county, then your state. The presidency is the highest administrative office in the country. I don't consider anyone without experience at the level of at least governor to be a serious candidate.