A group of women progressives who back Sen. Elizabeth Warren has formed Persist PAC, a super PAC airing pro-Warren ads starting Wednesday in an effort to boost her performance ahead of Saturday's crucial Nevada caucuses, a spokesman told Axios.

Why it matters: Warren has spoken adamantly against the influence of unlimited spending and dark money in politics. But these supporters have concluded that before Warren can reform the system, she must win under the rules that exist — and that whether she likes it or not, their uncoordinated help may be needed to keep her viable through this weekend's contest and into South Carolina and Super Tuesday.

John Rood, the Pentagon's top policy official, will resign from his post at the end of the month, CNN first reported and President Trump confirmed.

The state of play: CNN said Rood "was perceived as not embracing some of the changes in policy the White House and senior Pentagon officials wanted," such as peace talks in Afghanistan with the Taliban and a decision to cut back on military exercises with South Korea as the president courted North Korea's Kim Jong-un.

Hackers are using misspelled links in Rudy Giuliani's tweets to spread malware, CNET reports.

Why it matters: Giuliani, the former New York mayor and President Trump's personal lawyer, has more than 650,000 Twitter followers — including politicians, journalists and Trump Organization members — all of whom could unknowingly click an incorrect link that exposes them to malware.

Andrew Yang is joining CNN as a political commentator after ending his 2020 presidential campaign last week, the network announced Wednesday.

The big picture: The businessman — who has never held public office — gained national attention in the race through his emphasis on universal basic income, which he believes will alleviate social and economic ills stemming from technological change. He'll make his first CNN appearance to discuss Wednesday's Democratic debate in Nevada "to help shed light on the election and the candidates’ experiences."

Go deeper: Politicians ditch government for cable news

Unions across the country are at odds over Medicare for All, with some saying it would free them up to focus on wages and working conditions, while others argue that the health benefits they've already won are better, Politico reports.

The big picture: The fight reflects the larger battle over Medicare for All, but is particularly acute in union-heavy states like California, New York and Michigan. This has all come to a head in Nevada, after the Culinary Workers Union slammed Medicare for All and didn't endorse any of the candidates, providing a portrait of how divisive the issue is within one of the Democratic party's most loyal institutions.

Go deeper ... Medicare for All: Where the Democratic candidates stand

A group of top national polls released this week show Bernie Sanders in control of the 2020 Democratic race ahead of Wednesday's debate in Las Vegas.

The state of play: Joe Biden, who has been at the top of the polls for months, plunged after lackluster performances in Iowa and New Hampshire — allowing Sanders to surge ahead as billionaire Mike Bloomberg has cut into the former vice president's lead among moderate voters.

Mike Bloomberg's campaign is sounding the alarm that Bernie Sanders will soon amass an unsurmountable delegate lead if the Democratic field stays split — and took the extraordinary step of suggesting laggards should drop out.

What they're saying: Kevin Sheekey, Bloomberg's top strategist, said: "The fact is if the state of this race remains status quo — with Biden, Pete and Amy in the race on Super Tuesday — Bernie is likely to open up a delegate lead that seems nearly impossible to overcome."

Mike Bloomberg makes billions of dollars from Wall Street every year. But his plan to rein in the financial sector is very aggressive. If he were to become president, it would be fought vociferously by the biggest clients of Bloomberg LP, the financial-information company that's the source of the candidate's wealth.

Why it matters: Bloomberg's detailed financial reform policy, released Tuesday, could cost Wall Street trillions of dollars while significantly increasing regulatory scrutiny of financial activities. It's a vision that would not be at all surprising coming from Elizabeth Warren, but that was less expected from an avatar of red-blooded capitalism.

Pete Buttigieg addressed during a CNN town hall Tuesday conservative radio host Rush Limbaugh's claim that President Trump told him to "never apologize" for saying Americans wouldn't elect "a gay guy who kisses his husband on stage."

Details: Buttigieg, the first openly gay candidate to launch a major presidential campaign, defended himself following Limbaugh's remarks on his Monday show by reviving on stage in Las Vegas allegations by Trump's now-imprisoned former personal attorney Michael Cohen that the president directed him to pay hush money to adult film actress Stormy Daniels. Trump denies the claim.

Bill Barr's spokesperson tweeted Tuesday night the "Attorney General has no plans to resign" after multiple reports said he's considering leaving the administration over President Trump's tweets on the Justice Department.

Between the lines, per Axios' Jonathan Swan: Barr has made clear to Trump, both publicly and, repeatedly, in private conversations, that he can’t do his job if the president keeps publicly commenting on Justice Department criminal cases. Trump chose to ignore that warning on Tuesday, and a source familiar with the situation said it made a bad situation worse.

Flashback: Barr: Trump's Roger Stone tweets "make it impossible for me to do my job"

Sen. Bernie Sanders said in a statement Tuesday night he will request a recount of the Iowa Democratic Party's recanvass results.

Where it stands: Both Buttigieg and Sanders requested partial recanvasses in Iowa last week after results were delayed and showed several errors following a software malfunction on caucus night.