Genuine love of a single politician. Yes, maybe this person is legitimately good, or is doing positive things in certain areas and perhaps negative things in other areas. It’s largely subjective. If it weren’t, most countries’ citizens would just be happy.
But listen, if “this” person is the best and we’re going to harp on about it forever, and in the reverse harping on hating said person forever, then you’ve got yourself a cult.
If you love a politician, you’re an embarrassment. They’re certainly not as perfect as you think. We can acknowledge those imperfections and vote based on policy, but making a single one of them out to be perfect (or imperfect) means you’ve just chosen a side and you’re likely not even going to try to open yourself up to altering opinions.