The first two Democratic presidential primary debates are happening later this week, and on Monday we got a glimpse into how the candidates are preparing for their respective five to six-minutes of speaking time. Cory Booker, naturally, is doing push-ups because he just can’t help himself; Bernie Sanders is resisting the efforts of his advisors because he “has little patience for mock debates;” and Kirsten Gillibrand has been getting ready by channeling the spirit of the most petty among us. (That would be Mariah Carey, specifically.)