Kamala Harris was described as the Democratic front-runner before she even formally announced her candidacy.
In early July, she seemed poised to challenge the polling leader, Joe Biden.
Harris stood ahead of Bernie Sanders and Elizabeth Warren in RealClearPolling's July polls.
Now, according to FiveThirtyEight, her support has plunged.
She’s down to mid-single digits in most national polls.
What went wrong?
The main theory is that Harris has run a lousy campaign without any original policy ideas of her own.