A new book is shedding light on why former Vice President Kamala Harris did not pick Gov. Josh Shapiro (D-PA) as her Democratic running mate in 2024, even though a majority of analysts said he seemed like the strongest contender.

Some theories falsely claimed it was because of his Jewish faith, but the authors of the book How Trump Retook the White House and the Democrats Lost America said the real reason was that Harris and Shapiro were too similar, had competing political ambitions, and lacked chemistry.