Photo Illustration by Luis G. Rendon/Elizabeth Brockway/The Daily Beast/ReutersWelcome to Trail Mix, a fun but nutritious snack for your election news diet. See something interesting on the trail? Email me at jake.lahut@thedailybeast.com.This week, we dive into the disappearance of the typical primary campaign structure. Plus, a 2024 prediction from Sen. John Fetterman, and an exclusive interview with GOP presidential hopeful Doug Burgum following his pre-debate Achilles injury.“Billable hours.”