Scoop: GOP megadonor Ken Griffin says he'd back Rubio over Vance in 2028

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Republican megadonor Ken Griffin said at a private conference Wednesday that he'd support Secretary of State Marco Rubio over Vice President JD Vance in a 2028 GOP presidential primary, Axios has learned. Why it matters: Griffin is one of the most prolific donors in the Republican Party — he gave more than $100…