Tom Steyer is getting involved in Democrat-on-Democrat races

Kevin de Leon (left) and Tom Steyer (right). Photo: Angela Weiss/Getty Images

Tom Steyer, the billionaire Democratic activist, has announced he will endorse Kevin de León, Senator Dianne Feinstein's progressive challenger in California, per LA Times.

Why this matters: The endorsement goes against what Steyer previously told Axios, which is that he wouldn't endorse specific Democratic candidates. "We feel as long as they’re good Democrats then we will try to stay out of it," he said back in January. "We have done it very rarely, only if we really feel that there’s a Democrat who doesn’t live up to large D Democratic principles."