Asked to describe a decisive life moment that put him on a broader path, Gravel (left) responded: "Realizing human governance is extremely complex and that representative government is broken. And so, there's only two venues for change: One is the government, where the problem lies, or the people."

Biden cited the civil rights movement. "I found out and realized that it does make a difference if you're engaged. You can actually change the state of the nation."