Some of the country’s biggest Democratic donors — including Tom Steyer and Jonathan Soros — are huddling behind closed doors next week in Chicago with union bigwigs and progressive superstars like Bill de Blasio to plan how to pull their party — and the country — to the left.

The setting is the annual spring meeting of the Democracy Alliance, a secretive club of wealthy liberals that’s the closest thing the left has to the vaunted Koch brothers’ political network.

The DA, as the liberal group is known to insiders, is increasing its ranks of rich donors for the first time in years and is gearing up to spend huge sums on political data, voter registration, ground organizing and advertising to influence the 2014 midterms and 2016 presidential elections. Potentially more significant, the groups’ donors also could play an important role in determining whether the post-Barack Obama Democratic Party embraces the rising tide of progressive populism or hews to a more cautious, centrist course — in other words, whether the Hillary Clinton wing or Elizabeth Warren wing will seize the reins…

According to a conference agenda obtained by POLITICO, panels will focus on elevating progressive issues like income inequality, climate change, drug reform, gun control, abortion rights and the death penalty.