The purple-maned Rapinoe announced her endorsement in a video posted on social media that shows her speaking on the phone with Warren.
"I've been following very closely ... what your campaign has been doing. And I just think it's amazing. It's big, it's bold," Rapinoe tells Warren in the video via phone. "I just don't think we can get to a better place by walking this moderate line, so I appreciate you being out front and being bold with that."
U,S.A. U.S.A., Superstar and Superhero!