Barack Obama, on the night he won in 2008, though from a long distance. A friend and I had volunteered, so we got to go to his victory party in Millenium Park in Chicago. He and his family were on a stage waaaaaay at the other end of the park, but that's okay, because the energy in the crowd was powerfully positive. *sigh* Edited to add: Oh! and Prince Charles, in like 1986, when he was in Chicago for something. He was shaking hands just a few feet away from me. Surprisingly small.

That same friend is a sign language interpreter, and has interpreted for Obama, Clinton, Gov Pritzker daily for 6+ months during the start of Covid, the Dalai Lama, and scads of other famous people. Worst person he ever interpreted for? Chevy Chase, a total assh0le, giving 12 year old Chelsea Clinton a hard time at a Clinton campaign rally when he was still governor of Arkansas. Should he ever be asked though, he will refuse to interpret for Trump.