The California senator's campaign seemed full of promise when it launched in January, but she struggled to make headway in a crowded field.
In November her cash-strapped bid laid off staff at its Baltimore HQ and in New Hampshire and her home state.
The 55-year-old, a vocal critic of President Donald Trump, was once seen as a rising star within the party.
But she could not cement her fleeting position in the top tier of candidates alongside Joe Biden, Bernie Sanders and Elizabeth Warren.
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