The full story is that one guy appointed to the President's advisory council on faith-based partnerships (another body that appears to be oriented toward a lot of talk and discussion with no real results expected) is a homosexual rights activist. It should come as no surprise that this advocate for, among other things, homosexual "marriage" does not care much for any organization that is taking a stand in defense of traditional marriage as understood by the Catholic Church.
The Knights of Columbus are placed in pretty good company:
According to CNSNews.com, Knox has described Pope Benedict XVI and certain Catholic bishops as “discredited leaders” because of their opposition to same-sex marriage. Though granting the Knights of Columbus’ “good works," Knox also called the organization’s members “foot soldiers of a discredited army of oppression” because of the Catholic group’s support for the successful California ballot measure Proposition 8. Proposition 8 restored the definition of marriage to being between a man and a woman.
So the headline is a little misleading. This activist did not call the Knights an army of oppression, rather he called it's members "foot soldiers" in an army of oppression. The leaders of this army are Pope Benedict XVI and "certain Catholic bishops." Yeah, that sounds about right.
To defer some of the Obama Derangement Syndrome, it should be noted that, also appointed to the advisory council, are the General Counsel to the US Conference of Catholic Bishops and the President of Catholic Charities USA. We can hope that they will bring an authentic Catholic voice to the council.