Photo: Paul Zimmerman/WireImage/Getty Images

David Koch, a billionaire libertarian who supported conservative causes and campaigns, died at the age of 79, according to an announcement from his family on Friday.

Why it matters: Koch and his brother Charles built a massively influential network of donors that backed politicians who supported economically conservative policies, though he stepped away from his work last year due to his deteriorating health. The Koch network has faced criticism from President Trump throughout his tenure — notably due to breaks on immigration and trade — and said it would not support his re-election efforts earlier this year.

Go deeper: The Koch network is open to backing Democrats in 2020

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Cleanup on aisle Biden

Photo: Andrew Caballero-Reynolds/AFP via Getty Images

After two gaffes and a low blow from President Trump questioning his faith, Joe Biden spent Thursday evening off his own message — clarifying comments and responding to attacks.

Why it matters: Biden’s responses reflect what we could see a lot more of in the next few months — cringeworthy comments and Trump smears, smacking into each other and pulling the Democrat off course.

2020 election strategy: Hire all the lawyers

Illustration: Eniola Odetunde/Axios

The coronavirus has sent overall U.S. unemployment into the double digits — but it's a sort of full-employment act for election law attorneys.

The big picture: The prospect of extended court fights over COVID-19-related voting changes, an absentee ballot avalanche, foreign interference and contested presidential results has prompted a hire-all-the-lawyers binge by candidates and campaigns — not just in swing states but around the country.

Right-wing media defanged by dissolving anti-Biden storylines

Data: NewsWhip; Chart: Naema Ahmed/Axios

The three biggest anti-Joe Biden storylines in right-wing media over the last year have either fizzled or are getting less online traction than they used to, according to data from NewsWhip provided exclusively to Axios.

Why it matters: This dynamic has rendered a formidable media ecosystem less effective in boosting President Trump as we move into the heart of the 2020 campaign.