So the Ayers thing....
It matters because no matter how old Obama was when Ayers committed his acts of terrorism, the point is that Obama had to know who Ayers was and what Ayers did by the time he grew up *and befriended him*. Also, and this is no small part, Ayers is unrepentant of what he did. He remains unrepentant to this day. Don't think that doesn't matter.
In other words, McCain happens to be painted with the same broad political brush as David Duke. But you wouldn't catch McCain hanging out with that extremist nutball. Why does Obama get a pass on Ayers?
Heck yes, if the guy applying for the job of Commander in Chief has friends and associates who avidly and openly hate America, I have a HUGE problem with that.
And no, I wouldn't vote for McCain if he had ties to David Duke.