UPDATE:
I got Cindy on the phone and she continued to maintain that the threat of arrest was real, but said that it came to her via Diane Wilson. I spoke to Diane, who said that it came from Texas State Rep Lon Burman, a Democrat. She said that he was not speaking on behalf of or communicating any information from the Bush Administration or the Secret Service or the Sheriff's Department. But she maintained that what he had predicted was already starting.
http://www.dailykos.com/storyonly/2005/8/8/124941/6758
So now we know where this phony rumor came from.
Thanks for the update.
The rumor served its purpose though - it fired up the looney dingbats on the leftwing forums, played to their irrational fears, and got the them to shell out some bucks to socialist fronts pretending to be "peace organizations."
Those dopes fall for every trick in the book.