US: Is the anti-gay movement more organized than the pro-gay movement?

In the most recent Newsweek to show up in my mailbox...it stated that they got over 40,000 readers who responded to their coverstory titled "The Religious Case for Gay Marriage."

And also according to Newsweek, the vast majority of those 40,000 responses were as a result of a letter-writing campaign encouraged by the American Family Association.

So...reading all of this...I started to wonder...is the anti-gay movement more organized than the pro-gay movement...?

And if yes...why...?

I am not trying to be wise...nor asking a question I already think I have the answer to...

I really would like to hear what people think about this.

If you didn't read the Newsweek article...here is a link...

Cover Story: Gay Marriage