I don’t think many in either party are worried about small donations. But the concern from Dems is usually the unlimited donations as one billionaire could match the financial influence of millions of non-billionaires.

Kamala raised 2:1 from campaign contributions (limits: https://www.fec.gov/updates/fec-announces-2023-2024-campaign...), while the inverse was true for Trump.

Source: https://www.opensecrets.org/

In politics what’s pretty consistent is it’s almost always a debate about what’s to my advantage or not, masquerading as a principled argument.