Notes
Hot. It seemed hotter than the 64 degrees reported by Garmin. It was sunny, hot, and humid, and it was a struggle for me to finish. My last 3 marathons have been struggles with cramps, and they have started pretty early. Heat and humidity are obvious factors at 2 of them (Disney and Grandma's), but I even cramped 5 weeks ago at Lake Wobegon in relatively cool conditions.
My long runs and weekly mileage have not been what they were last summer while training for TCM, so that would be the logical place to start.