Dark money groups associated with Senate Majority Leader Chuck Schumer and House Speaker Nancy Pelosi have injected nearly $20 million in hidden donor cash into the midterm elections, federal records show.

The election cash has gone to the Senate Majority and House Majority PACs, which are tied to Schumer and Pelosi. The PACs bankroll Senate and House Democrats, many of whom rail against dark money’s political influence.

Majority Forward, a nonprofit that does not identify its donors on tax forms, has poured nearly $15 million into the midterm elections up to the end of March, Federal Election Commission records show.