Happy Tuesday, welcome back to The Stratosphere.

Today, I’ve got a potpourri of items from around Silicon Valley and Washington—new reporting on the political moves of Marc Andreessen, the friends who can broker an introduction to MacKenzie Scott, the billionaire host behind the hottest party of the weekend, and an interview with the provocative and influential Democratic donor-adviser, Dmitri Mehlhorn.

But first…

• Venture capitalists Keith Rabois and David Sacks are staging a big blowout event for Republican Senate candidates next month, according to an invite passed my way. Nine G.O.P. hopefuls will be at the Miami home of Rabois and husband Jacob Helberg on the evening of September 15: Mehmet Oz, Blake Masters, J.D. Vance, Marco Rubio, Adam Laxalt, Ted Budd, Joe O’Dea, Tiffany Smiley and Chuck Grassley. Tickets run from $1,000 to $50,000. Sacks and Rabois continue...

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Mehlhorn, who entered politics after a decade at GLG and then some years fighting the teachers’ unions at various advocacy groups, quickly achieved first-name status within elite Democratic circles—not always for the right reasons, as he made fierce defenders and fierce critics alike. While Dmitri isn’t always speaking for Hoffman, he is, without a doubt, one of the most powerful people in the Democratic donor world—playing host, for instance, to a 2020 donor table that featured Biden officials and helped steer big money behind the scenes to super PACs and dark-money groups. (Mehlhorn advises other donors besides Hoffman, but doesn’t disclose them.)...