OP here. I'll tell you why I even thought to look for this. I'm from the area. I don't live in that exact town, but my grandparents do and my mom was raised there. I was driving around with my dad when the national news came on and mentioned something about John Podesta. My dad sort of muttered, "He from Mattoon...". I told him I always thought the Podestas were from Chicago, and he said, well maybe it was something where they were born in Mattoon and then their family moved to Chicago, but I do know there was always a Dr. Podesta in Mattoon. So I looked it up and sure enough, the first result on google other than his obituary was a forum discussing pedophilia. So no, I don't have anything that actually proves he's his uncle, but the way my dad was talking, it was just common knowledge.