From Boston.com chat-thingie today:

Fred_C__Church:
Q: Hey Peter, thanks so much for taking time out here. It's been mentioned that you once said the St. Louis Cardinal's fans are the "best fans in baseball." I know they are very loyal, and collegiate-like in the true midwestern spirit, but I know another team that could get that "best" tag...

PeterGammons:
I did once say that, and it was because they are so loyal. It was meant in the eyes of players, because there is little booing, only one paper covers the team so no one asks tough questions, and there is no Ch. 4-CBS to explore issues. Hence, McGwire and Edmonds and Rolen sign for way below value. However, in terms of passion and knowledge, Boston is unrivalled. Compared to Yankeeland, Mike Myers said, "New Englanders love the Red Sox, New Yorkers love winning." Very true