FRONTLINE investigates the lives and views of Sen. JD Vance and Gov. Tim Walz as they run for vice president. In a historic election, those who know the candidates best reveal the influences and ideas they would bring to the White House.

Also watch The Choice 2024: Harris vs. Trump, our critically acclaimed election-year special offering interwoven investigative biographies of both major-party candidates: Kamala Harris and Donald Trump.

Plus, read additional interviews from the making of this documentary as part of the FRONTLINE Transparency Project.