The fundraising numbers for the last quarter so far are:
Bernie Sanders - $25.3 million
Pete Buttigieg - $19.1 million
Joe Biden - $15.2 million
Kamala Harris - $11.6 million
Andrew Yang - $10 million
Cory Booker - $6 million
It is important to note that warren's numbers aren't out yet.
But those are not good numbers for Biden. He raised 30% less than last quarter. While Andrew Yang, Bernie Sanders and Cory Booker are all way up. (Yang 257%, Sanders 39%, Booker 33%). Harris has held steady and Buttigieg is down 23%.
It is also worth noting that Sanders has not done any large dollar fundraisers. His average donation size was $18. It takes a whole lot of donations to get to $25.3 million when you are doing it $18 dollars at a time.
Biden on the other hand has done dozens of large dollar fundraisers. if he is spending that much of his time trying to fundraise and he still can't beat Sanders or Buttigieg, that is not a good sign. He can't even hold his numbers steady from last quarter.
It is also critical to keep in mind that there are caps in place for how much you can donate. Over 99% of Sanders' donors have not hit that cap as they are all small dollar donors. So it is likely he can keep this up. Biden is relying on large cash donations, which means that many of his donors have likely hit their cap already and cannot donate again. I haven't seen a percentage for this quarter, but in his reporting for the previous quarter he reported that 38% of the $22 million Biden raised (in Q2) came from donors who gave the maximum amount possible to give in the primary. Which means that 38% of his donors from Q2 cannot donate any more money. That likely is part of the reason why his fundraising dropped by 30% in Q3.