He built a career, and a presidential campaign, on a belief in bipartisanship. Now, critics of the candidate ask: Is political consensus a dangerous compromise?

In Part 4 of our series on pivotal moments in the lives of the 2020 Democratic presidential contenders, we examine the long Senate career, and legislative legacy, of former Vice President Joseph R. Biden Jr. Guest: Astead W. Herndon, who covers national politics for The New York Times. For more information on today’s episode, visit nytimes.com/thedaily.

Background reading:

• Mr. Biden now plays down his role overhauling crime laws with segregationist senators in the 1980s and ’90s. In an investigation, our reporter found that the portrayal is at odds with his actions and rhetoric back then.
• The former vice president and current Democratic front-runner wants to unite the country in a divisive time. Here’s more on what Mr. Biden stands for.
• This Supreme Court battle explains why Mr. Biden firmly believes in bipartisanship.

In Part 3 of our series on pivotal moments in the lives of the 2020 Democratic presidential contenders, we spoke with Elizabeth Warren about how she came to be known as the blow-it-up candidate. With help from Andrew Ross Sorkin, a financial columnist at The Times and founder of DealBook, Harry Reid, a former Senate majority leader, and David Axelrod, a former Obama adviser, we explore Ms. Warren’s rise to prominence as an advocate for overhauling the financial system — and how that rise helps us understand her run for president now. For more information on today’s episode, visit nytimes.com/thedaily.

Background reading:

• The New York Times Magazine spoke to Ms. Warren in June, discussing the double standards that can confront professional women — and female presidential candidates.
• Ms. Warren has lots of plans. Together, they would remake the economy.
• We asked 21 candidates the same 18 questions. Hear Ms. Warren’s answers.

Part 2 of our series on pivotal moments in the lives of the 2020 Democratic presidential contenders. Michael Barbaro speaks with Bernie Sanders, the democratic socialist senator from Vermont.

Mr. Sanders reflected on his early schooling in politics and how he galvanized grass-roots support to evolve from outraged outsider to mainstream candidate with little shift in his message.

Guest: Bernie Sanders, the Vermont senator and candidate for the 2020 Democratic presidential nomination. We also speak with Alexander Burns, who covers national politics for The New York Times. For more information on today’s episode, visit nytimes.com/thedaily.

Background reading:

• Mr. Sanders has staked his presidential campaign, and much of his political legacy, on transforming health care in America. His mother’s illness and a trip he made to study the Canadian system help explain why.
• We asked 21 candidates the same 18 questions. Hear Mr. Sanders’s answers.

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.