I recently strong-downvoted a post that I would have weak-upvoted if it had been at a lower karma. In general, I usually vote primarily based on what I think the total karma should be. I'm curious whether other people do similar things.
This is both a question and a poll. The poll is in the comments; it works via upvotes but there is a karma balance comment. (Note that one can recover the non-weighted results (i.e., number of votes) by hovering one's mouse over the current score.) This is about votes on LessWrong only.
I'm also wondering whether this behavior is, in some sense, anti-virtuous. If everyone votes based on what they think the total karma should be, then a post's karma reflects [a weighted average of opinions on what the post's total karma should be] rather than [a weighted average of opinions on the post]. This feels worse, though I'm not entirely sure that it is.
Correction: as jimmy points out, voting independently of current karma does not give you a weighted average of opinions on the post because there are only a limited number of ways you can vote.
Meta: There's been some speculation about this (maybe read after voting), but nothing conclusive.
Current non-weighted results (08/28 07:05 EDT) (TK is 'target karma'.)

Yeah, this seems like a pretty reasonable reaction to me.
You're right about the dependence on order. However, it's worth pointing out that there is another way in which karma will depend on order that exists without this norm: people will decide to click or not to click on a post based on current karma. So, for example, if a post is at 2 Karma, persons X and Y will both give it -2 upon reading it, but X will only click on it if it has at least 2 karma while Y only needs at least 0, then the order X→Y will lead to -2 karma, while Y→X will lead to 0.
And a third way karma could end up depending on order is if people's perception of how good a post is depends on how much karma it has.
You could still be right about introducing yet another dependence being a bad idea.