I'm assuming that if you counted every potential whistleblower in the US that was ever reported on in the national or local news over the past few decades, it would probably add up to something in the thousands?
And I already made clear, of course there can be a whistleblower on somebody you like, if that person broke the law. People aren't above the law, end of story. So why are you asking for examples? Examples don't matter. It's a principle that applies no matter which side of the political aisle you're on.