>The big donor though is neither Obama nor Trump. It's Mitt Romney.

For sure, I don't deny that. I'm not claiming anything about whether being liberal makes you "good" or "bad" w.r.t. charitable donations. I'm claiming that the liberals in this study might know some additional facts that would explain why they're more likely to believe the positive story about fake news in this case. It would certainly be interesting to retest this, but use Obama and Romney as the names instead.

There is an active industry devoted to providing charity vehicles to help launder bad reputations of extremely wealthy people.

Simple application of Goodhart's law.