Source?
1) Powerline Blog (Lawyers all)"Nor am I concerned if, as the Los Angeles Times reports, Roberts helped lawyers in his firm who were arguing before the Supreme Court, in a pro bono representation, that the Constitution protects people from discrimination because of their sexual orientation. Roberts was the lead attorney in his firm's appellate practice. I consider it natural that he would assist his colleagues in a matter like this. The legal position Roberts was helping his firm (and other attorneys involved in the case) advance regarding what the Constitution does and doesn't protect was wrong, I believe, as a matter of law. However, it was not immoral."
2) Senator Fred Thompson on Rush's show today.
3) http://www.supremecourtwatch.org/roberts.aspx This website is full of left wing hatred of the Conservative history of Judge Roberts - check it out.
Source?
Read the LA Times article. He didn't volunteer, he was asked to help out.