SBF, but if "dark money" isn't concrete enough for you then the other co-CEO, Ryan Salame, donated about $22M openly to Republicans, and in the senate race SBF donated $66.7k to Republicans vs $49.2k to Democrats.
Not that it matters to the point that I was making but I wouldn't consider SBF a reliable source of the truth.
Remember this was the guy who said "FTX is fine. Assets are fine" and "We don't invest client assets (even in treasuries)".
I don't doubt that he did donate some money to the non ruling party but to quote what he is saying as truth or try and attribute a donation by an associated party to him is disingenuous.