Today we launch Part One in our series on pivotal moments in the lives of the 2020 presidential front-runners. In studio with “The Daily,” Pete Buttigieg, the mayor of South Bend, Ind., talks about how his lifelong political ambitions were complicated by the secret he kept for decades.

Guests:

• Pete Buttigieg, mayor of South Bend, Ind., and 2020 Democratic presidential candidate.
• Jeremy W. Peters, a politics reporter in the Washington bureau of The New York Times.