After more reading, more inspecting, and more thinking I started to have a deep suspicion that my tomatoes had been misdiagnosed. The spots seemed too small and too numerous to be blight. I saw multiple articles that discussed two different diseases, both common and commonly mistaken for each other. Maybe my plants had Septoria Leaf Spot rather than blight.I took some pictures of infected leaves and posted them on the forums of http://www.yougrowgirl.com/ (only the best website ever!) Sure enough, it is Septoria Leaf Spot! The treatment for the disease is the same as early blight: copper. Since the copper/sulfur dust that I had previously tried didn't work it was suggested that I try liquid copper instead. I bought some yesterday and sprayed.
Let's hope the copper works and I end up with some healthy tomatoes!
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