In a great example of integrated marketing, I saw a TV ad and then went to the site.
On the petition, they ask the basics and then you need to fill in the blank that says:
"I signed the petition because..."
So, I wrote:
"According to Thomas Cahill, the Irish Saved Civilization. This is the least we
can do."
His book is called How the Irish Saved Civilization (Hinges of History)