The Democracy Alliance was born of out of "The Killer Slide Show" which is chapter 2 of "THE ARGUMENT: Inside the Battle to Remake Democratic Politics" by Matt Bai (2007).
The Killer Slide Show was actually called "The Conservative Message Machine Money Matrix" and it was produced by politcal consultant Rob Stein in order to provoke interest in greater mobilization of funds among the massive fortunes of the left. This was to combat what he saw as already happening on the right.
Stein essentially had a vision for how uber-rich progressives could run the country more effectively as a sort of shadow government of the Democratic Party through the use of non-profit organizations.
Or as said in "The Blueprint: How the Democrats Won Colorado",
“The reason it is so important to control government is because government is the source of enormous power,” Stein continued. “One president in this country, when he or she takes office, appoints…5,000 people to run a bureaucracy, nonmilitary nonpostal service of 2 million people, who hire 10 million outside outsource contractors–a workforce of 12 million people–that spends $3 trillion a year. That number is larger than the gross domestic product of all but four countries on the face of the earth.”
“So the reason we’re doing what we’re doing…and the way we get progressive change, is to control government,” Stein said. “That’s what this is about.”
https://www.powerlineblog.com/archives/2014/10/a-lefty-explains-what-the-election-is-all-about.php
Democracy Alliance was formed by Stein in 2005 as the custodian of this network of progressive non-profits.
https://democracyalliance.org/about/