Ambinder comes up with reasons why the McCain Campaign’s Ayers push is not John McCain’s fault:

(1) He could put lots of money into an Ayers ad — video press releases don’t cut it.
(2) He could devote a stump speech to Obama’s associations and Obama’s associations only
(3) He could mention Ayers in a debate.

1. Why should the McCain Campaign pay, when the press is talking about it for free?
2. He’s using it now:

"Senator Obama has a clear radical, far-left, pro-abortion record," McCain said after being asked about the issue.

The answer prompted a shower of boos from the crowd members. They booed again when he mentioned William Ayers, who bombed U.S. facilities to protest the Vietnam War as part of the domestic terrorist group the Weather Underground. They booed again at the mention of Rep. Barney Frank, a liberal from Massachusetts.

 3. I actually think that would be a horrible idea strategically. Anyway his campaign got every network talking about it.

 As I wrote on Wednesday

Candidates are ultimately responsible for the campaigns they run. Boundaries are set from the top.  When advisers cross the invisible line, they are removed.

This attack is coming from the McCain Campaign, the RNC and their appendiges such as Fox News. John McCain could stop it if he wanted to.