Well, he inflated that figure a bit with ~$300,000 in general election funds he can't spend in the primary, meaning Bernie Sanders raised most for primary on Day One.
nytimes.com/2019/04/16/us/…
Why so much?
She built a 160+ person staff — dwarfing her rivals (Bernie Sanders has 80+ aides; Kamala Harris has 40+ aides).
nytimes.com/2019/04/16/us/…
He spent only 9.66% of what he raised in Q1.
What was his biggest expenditure? Remarkably, it was simply processing the deluge of small donations he received via ActBlue.
nytimes.com/2019/04/16/us/…