They Rule allows you to create maps of the interlocking directories of the top companies in the US in 2004. From their websites and SEC filings in early 2004, so it may not be completely accurate - companies merge and disappear and directors shift boards.

It's really quite amazing that the largest group on a campaign site is one protesting the candidate's action on the telecom-immunity bill. It seems as if administrators would have snuffed out the group by this point.