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Sen. Elizabeth Warren. Photo: Scott Eisen/Getty Images

The Working Families Party, a progressive labor group, on Monday endorsed 2020 candidate Sen. Elizabeth Warren for the Democratic presidential nomination, according to the New York Times.

Why it matters: The WFP gained national attention in the 2016 presidential election when it endorsed Sen. Bernie Sanders for the Democratic nomination. The party's early endorsement of Warren over Sanders signals that the Massachusetts senator is making significant inroads with progressive voters, a key wing of the Democratic Party.

  • Maurice Mitchell, the Working Families Party’s national director, told the Times that the group's opinion had changed since its 2016 endorsement of Sanders and that Warren received more than 60% in its internal endorsement poll this year.

What they're saying: Mitchell said that the party is committed to a progressive victory over Trump, even if it means defeating the Democratic Party's moderate center represented by former Vice President Joe Biden.

  • “You don’t defeat the moderate wing of Democrats through thought pieces or pithy tweets, you defeat their politics through organizing," he said.

Between the lines: WFP's endorsement may sway which candidate other progressive organizations choose to endorse. Sanders hasn't completely fallen out of favor with the progressive labor movement, as he received an endorsement from the United Electrical Workers of America in August.

The bottom line: Warren and Sanders will continue to compete for progressive endorsements and distance themselves from the moderate wing of the Democratic Party.

Go deeper: Elizabeth Warren unveils sweeping anti-corruption plan

Go deeper

21 mins ago - Politics & Policy

Senate Democrats settling on 25% corporate tax rate

Sen. Joe Manchin (D-W.Va.). Photo: Chip Somodevilla/Getty Images

The universe of Democratic senators concerned about raising the corporate tax rate to 28% is broader than Sen. Joe Manchin, and the rate will likely land at 25%, parties close to the discussion tell Axios.

Why it matters: While increasing the rate from 21% to 25% would raise about $600 billion over 15 years, it would leave President Biden well short of paying for his proposed $2.25 trillion, eight-year infrastructure package.

GOP pivot: Big business to small dollars

Illustration: Annelise Capossela/Axios

Republican leaders turned to grassroots supporters and raked in sizable donations after corporations cut them off post-Jan. 6.

Why it matters: If those companies hoped to push the GOP toward the center, they may have done just the opposite by turning Republican lawmakers toward their most committed — and ideologically driven — supporters.

CDC: Half of US adults have received one COVID-19 vaccine dose

Data: CDC; Chart: Axios Visuals

Half of US adults have received at least one dose of the COVID-19 vaccine and about a third are fully vaccinated, according to new data from the Centers for Disease Control and Prevention.

Why it matters: COVID-19 cases and hospitalizations are still on the rise, CDC director Rochelle Walensky said during Friday's White House COVID-19 briefing. With cases in many states being driven by variants, public health officials have emphasized the need to ramp up vaccinations.