I hope he/she has not left any eggs or such on the next crop of tomatoes. I have lost two plants but 3-4 are managing to survive. FYI, the one that seems to have the least issue with mildew is the Brandywine Pink tomato. This particular variety has leaves called potato leaves, very similar to potato plants.
If you have an idea what this little guy is, please let me know so I can post the information.