I rather thought he'd find a way to parlay his 15 minutes of fame into something more. And I note that "I have no interest in Congress for at least ten years"
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Americans give more money to charity than any other nation in the world

That's a bit questionable, at least when it comes to giving money internationally. See here Charity across the world - showing the USA as almost at the bottom of table per head of population.

Maybe he was talking about giving at a local level - sort of "charity begins at home". I don't know how the comparative figure work out there. (But of course "begins" isn't the same as "finishes".)

Maybe Joe's watchdog group could find time to look at this.