Parties existing isn't the problem, it's a two-party system that's the problem. The left-wing party of capitalism is still a right-wing party in the overall scheme of things. Many Democrats on the federal level are just as concerned with preventing progressives from getting anything done as they are with anything else. So essentially we have a one-party system which encompasses right and far-right. Many historical figures warned about a two-party system for that reason, Washington included.
We need ranked choice voting in every state ASAP, and we need to expand the House (and probably Senate) dramatically to allow for more parties' input, as well as to account for long-standing imbalances in states' population size. Of course, only the former do people have much influence in implementing, as it can be passed by ballot measure like marijuana legalization was.