Update 4/20
Day #59
Today: Fredericksburg, VA, to Alexandria, VA (83 miles)
Total miles: 3299
Tomorrow (plan): Linthicum, MD
Miserable weather for the entire day – that's about the best I can say. It was raining when we awoke, and it continued to rain while we got ready, had breakfast, and were transported in the van back to the coffee shop in the center of Fredericksburg. We departed at about 8:00 AM after donning all our rain gear and preparing ourselves for the long ride to Alexandria. Of course, putting on our magic rain jackets is supposed to make the rain stop, but it certainly didn't work this time. The temperature was in the low 50s, and as we rode we also got a bit chilled. The rain came down hard most of the morning, and when it slacked off a bit, it was only for a short time. The three of us rode together until about noon, at which time I think Bob began to appreciate my assessment that it is hard for a single bike rider to poke along with a fully loaded tandem, so we parted ways. 
It finally stopped raining at about 5:30 PM, but we were thoroughly soaked. In fact, this was one of those soakings when you can wring water out of your socks. It was also one of those times when you discover that when the word "rain proof" is used to describe a garment, there is probably some fine print somewhere you should have read. After experiencing considerable difficulty finding part of the recommended Adventure Cycling Association route near Ft. Belvoir, VA, we finally arrived in Alexandria at about 7:30 PM. John Wilson, a West Point classmate and roommate, and his wife Sharyn hosted us for the evening, and we had a very enjoyable time over dinner talking about old times, our children, and the bike ride.