Who is best suited to be the city's chief auditor? Democratic City Controller candidates Alan Butkovitz and Rebecca Rhynhart will square off on Tuesday, May 9 -- just one week before polls open. Hosted by The Philadelphia Citizen and the Committee of Seventy, the debate will be moderated by former Inquirer editor and WHYYNewsworks vice president Chris Satullo, who will interview each candidate before opening it up to 30 minutes of one-on-one debate and an audience Q&A. The event is co-sponsored by the Crosstown Coalition, and the League of Women Voters of Philadelphia. A live feed will also be streamed on Facebook.