Fine, then it’s not a political party outright, and instead a lobby. Or a trade association. Or a big bunch of very angry like-minded voters. The point is that such a group could exert leverage within the DNC coalition as a voting block. We already have these for other interest groups. DNC membership is really only useful for voting in primaries to most people anyway - it doesn’t have to signify allegiance or kow-towing to party power.