HN's voting "thingy" is obviously engaging a middle-ground positioning, especially when it comes to political views. Moreover I suspect that arguments are taken more serious when putting some "I try to be aware of my biases" upfront.

Especially among (more or less) non-political communities like this one an argument starting with a"I am an independent voter" premise is most likely going to get a better reception than a "I have been for years a dedicated follower of politician x". Not that I am a fan of this, quite the opposite - but there are other sites much more suitable for political "confrontations".