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Photo: Justin Sullivan/Getty Images

The long-anticipated Elizabeth Warren vs. Bernie Sanders fight has arrived.

Driving the news: CNN reported today, "Bernie Sanders told Elizabeth Warren in [a] private 2018 meeting that a woman can't win." Politico reported on Saturday, "Sanders’ campaign has begun stealthily attacking Warren as a candidate of the upper crust who could not expand the Democratic base in a general election."

Why it matters: Iowa Democrats caucus in less than a month, and you can expect this budding feud to pop up at tomorrow night's debate.

The big picture: The two are competing to unify the far-left flank of the party.

  • After New Hampshire in February comes a map friendlier to Joe Biden and mountains of spending by Michael Bloomberg and Tom Steyer.

Between the lines: The most important line in the CNN story is that Warren’s campaign declined to comment, notes Axios' Jonathan Swan.

  • Warren was in the room for Sanders' alleged comment — and, by not commenting, she allows the story to run.
  • ⚡"Elizabeth Warren recalled an explosive account of a meeting with Bernie Sanders in which he said he didn’t believe a woman could win in 2020," BuzzFeed reports.
  • The other side: Sanders denied saying this to Warren and blamed the story on "staff who weren't in the room [who] are lying about what happened."

The bottom line: Time spent fighting each other is time the campaigns won't spend going after Biden.

Go deeper: Warren says she's "disappointed" to be targeted by Sanders campaign

Go deeper

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COVID-19 drives smell loss awareness, research

A health worker carries out an olfactory test outside Buenos Aires. Photo: Alejandro Pagni/AFP via Getty Images

The pandemic has thrust a relatively unknown ailment, anosmia — or smell loss — into the international spotlight.

Why it matters: Researchers hope smell testing becomes as standard as the annual flu shot, helping to detect early signs of neurodegenerative diseases like Alzheimer’s and Parkinson’s.

Senate passes $1.9 trillion COVID relief package

Stefani Reynolds/Bloomberg via Getty Images

The Senate voted 50-49 on Saturday to approve President Biden's $1.9 trillion COVID relief package.

Why it matters: COVID relief has been a central promise for Biden, and passing the sweeping package has been a major priority for the administration and congressional Democrats.

Bryan Walsh, author of Future
3 hours ago - Health

Why we need to know COVID's origins

The WHO's headquarters in Geneva. Photo: Fabrice Coffrini/AFP via Getty Images

Geopolitical tensions are foiling efforts to get to the bottom of how COVID-19 originated.

Why it matters: Insights into how COVID-19 began can help us prevent future pandemics — especially if it involved any kind of leak or accident at a virology lab.