Photo Illustration by Elizabeth Brockway/The Daily Beast/GettyWelcome to Trail Mix, your 2024 election sanity guide. See something interesting on the trail? Email me at jake.lahut@thedailybeast.com.This week, we go inside the covert efforts to derail Robert F. Kennedy, Jr., before it’s too late for the Democrats. Plus, more exclusive details on the Biden campaign’s decision to join TikTok, and an interview with David Hogg.GLOVES OFFOn the surface, it might look like President Joe Biden and the n