Democratic mega-donor George Soros is backing a main super PAC dedicated to electing Hillary ClintonHillary Diane Rodham ClintonIntel Dem decries White House 'gag order' after Bannon testimony 'Total free-for-all' as Bannon clashes with Intel members Mellman: On Political Authenticity (Part 2) MORE as president in 2016.

The super PAC, Ready for Hillary, tweeted on Thursday that Soros would serve asĀ  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.