You can't just "start small" What does that even look like? How do you generate money with no national platform from which to appeal to people and drive funding? How do you generate name recognition when 80% of the electorate basically votes the same party the entire way down the ballot? (Largely out of fear of the other party gaining control) Without national prominence for your ideas you have nothing to run on, no party recognition, no money, and no structural support. People, and you are included in this Chi, say things like "I can't vote for anything other than Democrat because of the Republicans win they will do X, Y, Z" and vice versa we hear the same thing just swap the parties. This happens because our "winner take all" method of voting, over time, funnels people inevitably into two parties. And, even if you got a really good candidate, had funding, and could generate a campaign - you have to deal with decades of gerrymandering. Hell, even the Dems and Republicans concede huge swaths of the country thanks to this, much less some upstart. And perhaps most importantly, and as a Democrat you should see this most clearly of all this year, even when an insurgent third party voice rises up......they lose one way or the other. And when they lose the big tent party most associated with them absorbs their viewpoints into their own and assimilates the ideas as their own. Thus crushing any burgeoning third party before it even gets started.