As Bernie Sanders and Hillary Clinton agree to hold four additional debates, the Sanders campaign is seeking to highlight something that sets it apart from other candidates': it's raising no money from super PACs.

BuzzFeed News first reported Saturday that the two campaigns had agreed in principle to the additional debates if they are sanctioned by the DNC:

Both sides, still in separate negotiations with DNC officials, have agreed to attend the “unsanctioned” Feb. 4 debate in New Hampshire hosted by the Union Leader and MSNBC, should that event go forward, in addition to three others, to be held at later dates.

Currently, the next scheduled democratic debate is set for Monday, Feb. 11.

And on Friday, the Clinton campaign's main super PAC, Priorities USA Action, said that it had raised over $50 million, with over $40 million of it being raised in 2015.

The Sanders campaign said in a statement that the "big haul would give Priorities USA Action a bigger war chest than any Democratic super PAC ever before," as it sought to contrast its funding from rivals'.

"Bernie doesn’t want billionaires' money," said Sanders spokesman Michael Briggs. "He doesn’t have a super PAC. He believes you can’t fix a rigged economy by taking part in the corrupt campaign finance system in which politicians take unlimited sums of money from Wall Street and other powerful special interests and then pretend it doesn’t influence them."