To me it does look like early blight however in my area this does not begin until much later in the season after the plants have been under stress. Perhaps Georgia is farther along in the growing season. Try removing the affected leaves and stems and applying a fungicide or a copper spray. This blight is soil borne and prevention is the best method to reduce (probably cannot eliminate) this disease.
Wet weather and heat bring on conditions favorable to early blight...and many other similar diseases. Prevention tips include a good mulching program to stop soil splash up onto leaves. That is how the fungus vectors from soil to the plant. Also watering the soil rather than overhead watering which causes more splash. So how do you stop rainfall from splashing? Mulching. By keeping your plants as healthy as possible they will resist....but not eliminate...diseases better. Good air flow at the base of the tomato also helps. Thinning out some of the lower branches, especially those in contact with the soil is a must. By rotating areas of your garden so tomatoes are not in the same area every year will lessen soil disease. My small space that is not possible. End of season garden clean-up is essential. Remove all debris, especially previously diseased plant material. Any diseased leaves etc. should be removed from the growing areas.
Right now fungicide application is the best solution. Good luck.
