We know blog commenting can turn into spamming, but if done right and respectfully, commenting can be a good addition to a link building strategy as you know. So we have tweaked a custom google search to search for specific keywords and only return blog posts and web pages built on a popular open source CMS that all allow dofollow links in comments. You can find the search tool at http://commentlinkbuilding.info
This is interesting, I was always under the assumption that McCain was pro-choice and enjoyed that republicans on the right and evangelicals had a hard time with him. But I guess I was wrong on that, thanks for posting this!