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Sen. Bernie Sanders (I-Vt.). Photo: Mark Makela/Getty Images

Sen. Bernie Sanders (I-Vt.) is the runaway preferred 2020 Democratic presidential candidate for progressive activists, a Democracy for America survey published early Tuesday shows.

Details: In the online survey of 96,641 DFA members, Sanders achieved 42.3% support — 30 points ahead of his closest rival, Sen. Elizabeth Warren (D-Mass.) (10.52%).

By the numbers: In the first DFA poll in December, Sanders led at 36.2%, with former Vice President Joe Biden second with 15%. Biden's support has now slumped to 8%, while South Bend, Indiana, Mayor Pete Buttigieg's soared from nowhere to 3rd spot, with 9.7% support.

Go deeper: Bernie Sanders: Everything you need to know about the 2020 candidate

Go deeper

U.S. ambassador to Russia will return home briefly: State Department

John Sullivan, U.S. Ambassador to Russia, during a briefing in Moscow in 2015. Photo: Anton Novoderezhkin/TASS via Getty Images

The State Department said Monday that the U.S. ambassador to Russia, John Sullivan, will now be returning to the United States this week before returning to Moscow "in the coming weeks."

Why this matters: The statement, from a State Department spokesperson, comes just hours after Axios reported that Sullivan had indicated he intended to stand his ground and stay in Russia after the Kremlin “advised” him to return home to talk with his team.

Scoop: Leaked Ukraine memo reveals scope of Russia's aggression

Russian President Vladimir Putin visits a military exposition in Sevastopol, Crimea, in Jan. 2020. Photo: Mikhail Svetlov/Getty Images

Russia has been holding last-minute military exercises near commercial shipping lanes in the Black Sea that threaten to strangle Ukraine's economy, according to an internal document from Ukraine's ministry of defense reviewed by Axios.

Why it matters: With the eyes of the world on the massive buildup of troops in eastern Ukraine, the leaked memo shows Russian forces escalating their presence on all sides of the Ukrainian border.

Elon Musk: Autopilot feature wasn't enabled in fatal Texas crash

Photo: Patrick T. Fallon/Bloomberg via Getty Images

Tesla CEO Elon Musk tweeted on Monday that "data logs recovered so far" show the car's Autopilot feature was not enabled — and it did not have access to "full self-driving mode" — in the deadly crash in Texas involving the company's electric vehicle.

Background: Local investigators said they believed the car was operating without anyone in the driver's seat. At the time of death, one man was in the passenger seat, while another was in the rear seat, KPRC 2 reports.