What's The Story Here

According to the Times,

Senator John McCain has also been targeted by a liberal group suggesting that his years in a prison camp have made him unfit to serve as president.

If anybody passing by here knows, what's the group and where can I find their website? (I know about "Vietnam Veterans Against McCain", but they don't appear to be a liberal group, it doesn't appear that anybody takes them seriously, and they don't fit the description.)