Political campaign staff often keep hours way past what a volunteer with a 9-5 job has. It's a terrible life, terrible profession but it still draws in people that are willing to find meaning in being a workaholic and seen as "politically savvy".
From what I could find, working in a presidential campaign is mostly volunteer-based and pretty much full-time.
It sounded fun and like an incredible experience, but I was already working full-time and didn’t have that kind of availability. So I politely declined.