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Wisconsin Sen. Tammy Baldwin. Photo: Justin Sullivan / Getty Images

Conservative groups have already spent approximately $3.1 million on attacks ads attack Wisconsin's Democratic senator Tammy Baldwin, per HuffPost. They've spent another $1.6 million boosting her Republican opponents.

Why it matters: There are 10 Democratic senators up for re-election this year in states that Trump won. But if conservative groups spending is any indication, Wisconsin might be the hardest seat for Democrats to keep — and that should have the party worried at every level because Sen. Baldwin is one of two Democrats serving statewide in Wisconsin.

Republican turnout in the election could be increased by Scott Walker, the state's Republican governor, who is also up for re-election this year too, which means his loyal base of Republican voters will likely be energized to show up on election day. And although it was short-lived, two of Baldwin's Republican opponents (Kevin Nicholson and Leah Vukmir) signed a "unity pledge" vowing to support one another and run campaigns "focused on defeating Sen. Tammy Baldwin."

One more thing: The amount of money conservative groups have spent on ads attacking Baldwin so far is "is more than what all the other Democratic Senate incumbents on the ballot this year have faced combined (under $550,000)," per HuffPost, which cites the Center for Responsive Politics.

Go deeper

Updated 1 hour ago - Economy & Business

The billionaire balloon

Data: World Inequality Report 2022; Chart: Axios Visuals

The super-rich are getting stupid rich: New data out today shows the share of global wealth held by the richest slice of humanity swelled by almost a full percentage point during the pandemic.

Driving the news: The top 0.01% of individuals now hold about 11% of the world's wealth, compared to just over 10% in 2020, according to the "World Inequality Report 2022," written by Lucas Chancel, Thomas Piketty, Emmanuel Saez and Gabriel Zucman.

Tina Reed, author of Vitals
1 hour ago - Health

Omicron gives a shot to boosters

Expand chart
Data: CDC; Chart: Will Chase/Axios

Vaccination rates have ticked higher since the discovery of the Omicron variant, CDC data shows.

By the numbers: The seven-day average for vaccinations in the U.S. reached about 1.8 million on Monday, up from an average of about 1.3 million a month ago.

Scoop: Over 200 papers quietly sue Big Tech

Illustration: Allie Carl/Axios

Newspapers all over the country have been quietly filing antitrust lawsuits against Google and Facebook for the past year, alleging the two firms monopolized the digital ad market for revenue that would otherwise go to local news. 

Why it matters: What started as a small-town effort to take a stand against Big Tech has turned into a national movement, with over 200 newspapers involved across dozens of states.