As of my last update, Dave Portnoy, the founder of Barstool Sports, is known for making various public bets on sports events, including horse racing. However, specific details about who he bet on in the most recent Kentucky Derby would require checking current or recent sources, as his betting choices are not static and can change from one event to another.
To find out who Dave Portnoy bet on in the latest Derby, you would need to look at his social media posts, such as on Twitter or Instagram, or check recent articles from Barstool Sports or other sports betting outlets that may have reported his picks. Please note that the information might be subject to change, and it’s always best to verify from a reliable source close to the time of the event.