Paywalled story from the Financial Times on the changing ecosystem of large donors on the Republican side:

A new class of political donors is funnelling millions of dollars to far-right Republicans, as growing dissatisfaction with the party establishment fuels support for hardline causes such as resistance to raising the US borrowing limit. Unlike previous generations of conservative megadonors — often Wall Street types who poured money into major fundraising vehicles — the new, more geographically diverse cohort is making targeted donations to far-right candidates and the groups supporting them. As a result, rightwing groups including the anti-tax Club for Growth and House Freedom Action, a political action committee that supports lawmakers in the hard-right House Freedom Caucus, are wielding increasing leverage over key issues.