Vice President Joe Biden met privately with Sen. Elizabeth Warren on Saturday in his residence at the Naval Observatory, CNN has learned, another sign he is seriously deciding whether to jump into the Democratic presidential race.

The meeting between Biden and Warren, confirmed by two people familiar with the session, is the biggest indication yet that Biden is feeling out influential Democrats before announcing his intentions.

Beloved by liberal Democrats, Warren decided to sit out a campaign of her own, but she has yet to formally endorse a candidate. In an interview on Friday, she told WBZ in Boston: “I don’t think anyone has been anointed.”