Do a simple Google search and you will see Daly's name mentioned EVERTIME the Gun ban is discussed. Saying that his being a co-author if it justifies DELETION is like saying the McCain/Feingold Bill, should not be on Feingold's wiki page, which would be ridiculous. 

FOXNEWS: Supervisor Chris Daly, who proposed the measure, said he and other supervisors already have received threatening phone calls and e-mails from gun supporters. http://www.foxnews.com/story/0,2933,144930,00.html

SFGATE: Supervisor Chris Daly, author of the measure, said that police are exempt from the handgun ban and the ban. http://sfgate.com/cgi-bin/article.cgi?f=/c/a/2005/11/10/BAGGCFLLCI1.DTL