Married to his high school sweetheart Christie Renee Rowan, Mullin is a father of six: Jayce, Jim, Andrew, Larra, Ivy and Lynette. Three children — Ivy, Lynette and Jayce — are adopted. A former undefeated MMA pro (5-0), he was inducted into the Oklahoma Wrestling Hall of Fame in 2016 and remains active coaching youth.
First elected to Congress in 2012, Mullin won a 2022 special election to the Senate and was sworn in in 2023, becoming a Cherokee Nation citizen to serve in the chamber. His record includes an ethics probe into his family business, which found he sought guidance and substantially complied, and an order to return $40,000 mistakenly paid in 2013. He also drew headlines in 2023 for a heated exchange with Teamsters President Sean O'Brien during a hearing.