They are spending money on both sides.
AIPAC spent $60M on the Michigan primary alone. George and Alex Soros dropped a full $100M this election cycle. Crypto billionaire Chris Larsen was spreading his $65M all over the board. Michael Bloomberg allocated $80 million just during September and October 2026 to support Democratic candidates. This, after he'd dropped a cool billy trying to buy out the 2020 primary. Tom Steyer put up $213 million this year, for California Governor.
There's no shortage of liberal billionaire mega-donors.