Democrats/Progressives/Socialists have no real or realistic platform to run on. They will chew each other up in the primaries. Running on the "collusion delusion" is not a platform for success. They really don't have a viable candidate right now who can win in the South, "flyover country", the interior West, etc. They keep pushing each other farther left and more extreme in their positions.
https://www.yahoo.com/news/mueller-hopes-gone-goes-progressive-103001195.html
https://www.yahoo.com/news/mueller-hopes-gone-goes-progressive-103001195.html