I agree with you that neither candidate is the best possible person for the job, problem is: the best possible person for the job wouldn't want it, or couldn't find the backing.
I'm just saying that it doesn't substract (for me at least) from my opinion of Obama that he might be an acquaintance of someone who was a extreme political activist during the Vietnam war. Not that I condone Ayers' actions, I just don't think they are relevant in this case. There are a lot worse things about Obama than him perhaps being a friend of a 60s 'terrorist'. (I use the quotes not to indicate that I disagree with him being a terrorist, but rather because I think that label is being slapped on anything that moves these days).
From where I'm standing (across the Atlantic) Obama seems like the best candidate of those remaining, but perhaps 'least worst' is a better expression. I've said it before, but I really don't like the election system in the US. Now, I realize that as a European, I am a leftwing liberalist by default, but it seems like money has an awful lot to say in the elections, which they ideally shouldn't have. Money (candidacy budget) is also a factor here when it comes to elections, but nowhere nearly as much as (it seems like) it is in the US.
The general attitude towards the US has actually improved a lot here over the last year or so. From the "those idiots elected Bush twice" to "poor saps, now he's gone and ruined their economy - we hope they get someone better the next time". This is naturally a completely unfair overgeneralisation, but Bush really had a tremendous impact on Danes' (and I suspect many other Europeans') image of the US.