Fenno's Paradox is something to do with how people feel about their political leaders. It's named after Richard Fenno, who was a professor of political science in the 1970s.
He noticed that people usually don't like their national leaders, but they like their own local leaders. It's kind of like a paradox because they are both in politics and should have the same feelings about them - but people don't!
Fenno explained this by saying that people get to know their local leaders in a different way - they know them as people, so they can see the good things about them. But when it comes to national leaders, people generally only know the bad things about them. Maybe that's because national leaders are so far away.
So Fenno's Paradox is that people don't like their national leaders, but they like their local leaders even though both of them are in politics.