WATCH: @SenMullin shares an emotional story about how @POTUS was there for his son and his family in their time of need: "Every week, if not most days, @POTUS would call and ask how he could help... he didn't do it for publicity. He didn't do it for any show. He was running in one of the toughest elections he had been in, and the guy was still that concerned about my son."