Laura Benshoff looks at the negative ads in the Montgomery County District Attorney race. Tom MacDonald follows City Commissioner Anthony Clark, who made a rare appearance in his City Hall office today. Kevin McCorry hears a preview of Philadelphia Mayor Nutter’s final keynote address. On SkyTalk, Dave Heller and Derrick Pitts discuss stargazing opportunities for the Halloween weekend. Peter Crimmins reports on the newest additions to the city’s walk of fame, including The Roots.