As much as the DNC would wish that America would embrace Socialism with open arms and become a Socialist, also-ran, 3rd world hell hole, it isn't going to happen for a few more years.
The DNC doesn't have anyone to run against Trump in 2020. At least, not anyone who is going to beat him. Although, you might hear some lame excuse that that candidate actually won by the number of votes they would have gotten if people would have voted, or some kind of tripe like you hear about Hillary.
Socialism is the supreme goal of the DNC. Their problem is they still can't sell it to the majority of America at this point in time. That's why Trump is in office. Eventually, America will become Socialist, but it won't happen until a lot of older people alive right now are dead. Once the Millennials are the predominant majority of the population, Socialism is a given. But I think that that particular segment of the population fails to realize that when a country fully embraces Socialism, the next activity on the agenda is that large amounts of the population have to be killed off. Everything being "free" for awhile comes at a cost and that cost is that lots of people considered undesirable, unproductive, or irritating have to be eliminated. And Socialism achieves that goal better than any other system.