Democratic mega-donor George Soros is backing a main super PAC dedicated to electing Hillary ClintonHillary Rodham ClintonDem 2020 hopefuls lead pack in opposing Trump Cabinet picks Perez to hit the Sunday shows following election victory Five takeaways from CPAC MORE as president in 2016.

The super PAC, Ready for Hillary, tweeted on Thursday that Soros would serve as  one of the co-chairs of the group's national finance council.

Soros, a billionaire hedge-fund manager who has launched a number of liberal advocacy groups, has pledged $25,000 to the PAC, according to Reuters.

"His support for Ready for Hillary is an extension of his long-held belief in the power of grassroots organizing," Soros spokesman Michael Vachon told Reuters.

He previously contributed to President Obama's 2008 campaign, and during the 2012 cycle, gave $1 million to both liberal super PAC Priorities USA Action and American Bridge 21st Century.

Clinton hasn't yet made a decision on the race, but Ready for Hillary has been building a network of donors and supporters to help entice her to enter the race.

The group is focused largely on grassroots organizing, but it's drawn the support of a number of big-name Democrats as they jockey to come out as early backers of a Clinton presidential bid.