"Let us meet it with our confidence and our boldness with the best tradition of this country," he said.

On electoral college reform, O'Rourke said he still does not fully understand how "the loser got 3 million more votes than the winner" in the 2016 presidential election in which Hillary Clinton received more popular votes that Trump.

"It doesn't make sense to me," he said, noting he would support electors being selected proportionately based on the popular vote.

Shirley Davis, who described herself as a 63-year-old middle-class retired registered voter, expressed her concerns that the Democratic Party is "too divided."

"Divided we will fall, together we will stand," Davis said. "It is too much. I know the reason we are doing it to get the one that is in office out, but our camp is getting too divided and we got to stop. We are going to mess around and divide and divide and divide until we are going to lose just like we did when Trump won."

"Have you ever noticed that everyone goes in there with black hair comes out with gray hair?" Davis said of the presidency.

O'Rourke said he is mentally prepared for the challenge and is ready to bring unity where President Donald Trump has brought division.