More than any other Clinton group, Correct the Record is most directly tied to Clinton’s campaign committee. Although federal law prohibits super PACs and candidates from coordinating paid messaging, Correct the Record nevertheless argues that it can work with the Clinton campaign to produce and publish material posted online for free — and it does.

In December, super PAC Priorities USA Action donated $1 million to Correct the Record. The Clinton campaign itself gave Correct the Record more than $281,000 last year for “research” services. American Bridge 21st Century is also a contributor.

Lately, it’s been highly critical of both Trump and Sanders. Correct the Record has not aired television or radio advertisements as pro-Clinton super PACs such as Priorities USA Action have.

Founded by Brock and once a project of American Bridge 21st Century, Correct the Record became its own entity in 2015, billing itself as a “strategic research and rapid response team designed to defend Hillary Clinton from baseless attacks.” Brock tapped Democratic operative Brad Woodhouse to run Correct the Record, and Kathleen Kennedy Townsend, the former lieutenant governor of Maryland, became its chairwoman. Also involved: longtime Bill Clinton adviser James Carville.

Through Dec. 31, Correct the Record has this election cycle raised $3.4 million and spent about $3.1 million. It must report its finances for the first three months of 2016 by April 15.