"Turning up for church hall meetings was well and fine. But haven’t you heard that Americans are bowling alone? Better to email. Phone banking turned into text-a-thons, where volunteers sent millions of text messages to cellphones we had not yet learned to ignore.... That... felt like the future in 2008.... By 2020, the Democratic advantage in digital campaigning was long gone.... As algorithms turned neighbors into unrecognizable partisans with crazy conspiracy theories, Silicon Valley abandoned the Democrats for Trump. Through it all, the frantic fund-raising text messages just kept coming.... [In the Michigan primary,] Abdul El-Sayed upset the deep-pocketed, establishment choice, Haley Stevens, by building a relational campaign on an economic populist message. El-Sayed won, in part, by characterizing the $62 million in outside money that backed Stevens’s campaign as a sign of... political corruption...."
So... money isn't the answer. You need something other than money, and the socialists do have something. How, then, can they be stopped? The linked column puts it like this: "I’d be looking for the candidates who are thinking and running as if they know that bases are made of people, not dollars."
If you really wanted to show that you are about people, you wouldn't say "bases are made of people." You'd say people matter and hide that the reason they matter to you is they're what is required to make a "base."
The socialists are to the Democratic Party what the Tea Party was to the GOP. All they need now is their Trump.