Seriously, though, those blog submissions on SEOmoz made me almost sick to my stomach with nervousness for the candidates.
Me too...particularly since, after I voted, I saw that one person had not yet received a single vote! They were all very good entries, but we only got 1 vote - so I couldn't pick a second favorite.
I actually voted for the one which I felt conveyed the most personality, as it happens. Like you, what I want from a blog post is the viewpoint of a single person - I want to get a sense for what they think about a subject. This is the critical difference, in my mind, between a blog post and an article - I read an article for information. It may or may not contain personal information; I don't really care. But I do consider a blog to be more personal.
The question of politics is excruciatingly complicated...ultimately, the decision rests on a lot of issues. Rand was right - he has an obligation to his company to avoid these issues, because he can't just make that decision for everybody. Aaron can - SEObook is his company pure and simple. But, regardless of whether you CAN make the decision - writing about politics or any other highly controversial subject can be very difficult.
Personally, I don't write about politics (except in a general sense) on my business blogs. This is inexact, because technically speaking, accessibility has distinct political aspects - and can certainly be very controversial.
However, I reserve my stronger political opinions (in theory, at any rate) for my environmentalism site - that's where I think they're more appropriate.
The fact is, my opinions are out there and available for perusal - and if somebody is concerned enough to connect the dots, then they can form a relatively complete picture of who I am. I figure that anybody who's going to go to that much work either 1) agrees with me and is curious to learn more -or- 2) disagrees with me and wants more evidence to lambast me with. However, most people are only concerned with how what I say relates to them, I imagine. So, for those people, I tend to keep my blogs within a fairly narrow scope.