Bernie Sanders says Elizabeth Warren could have helped him win the 2020 primary but 'chose not to' by withholding her endorsement

• Sen. Bernie Sanders says Sen. Elizabeth Warren's nod could have helped him win in 2020.
• Her endorsement ahead of Super Tuesday "could have been significant," he wrote in his new book.
• Those contests in March 2020 followed a major feud that erupted months earlier between Sanders and Warren.

Sen. Bernie Sanders says fellow progressive Sen. Elizabeth Warren could have helped him win the 2020 Democratic presidential primary but "chose not to."

In his new book, Sanders revisits his former rival's decision to remain in the race for the nomination ahead of Super Tuesday — thus, dividing the progressive vote — rather than dropping out and endorsing him.