Madison Cawthorn on Instagram: "This young man who faces so many challenges taught us a lesson today. He noticed my shoe untied, and with his secret service uniform on, suffering from a terrible condition, he bent down without asking and started to tie my shoe. He was the youngest man around yet in service he gained the attention and respect of everyone around. He could have delivered any message to the gaggle that formed around him. Service to others is how you become a leader, and DJ Daniel is

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