Kali Gaddie was a college senior when the pandemic abruptly upended her life plans—and made her part of a big and deeply unhappy political force that figures to play a huge role in the 2024 election season. Her graduation was postponed‚ she was let go from her college job and her summer internship got canceled. She spent the final months of school taking online classes from her parents’ house. “You would think that there’s a plan B or a safety net‚” she said. “But there’s actually not.”...