Well, it was a pretty silly counter to Bush's point about many of the forests in the west. Because lumber companies are not allowed to pull dead and dying trees, there is always a TON of fuel ready and waiting for the next forest fire. I grew up right in the heart of it - 50 miles from Yellowstone where the lack of management burned almost half of the park down. On the other side of the Idaho border, they have managed areas. Its not hard to guess which area sees more catastrophic fires. The one that isn't managed of course. Lumber companies are only too happy to pull the deadfall out and make use of it but generally aren't allowed to.
Factcheck.org dug up what Kerry was talking about. In 2001, Bush had owned stock or interest in a lumber company. Overall profit for Mr. Bush? $86. He hasn't owned stock since that year apparently, but tax-wise he was qualifiable as a small business owner. So it is perhaps a valid point, but its a pretty weak one. Kerry was trying to make the point that Bush was somehow motivated by this to push for the interests of lumber companies. What, for $86?? Gimme a break.