This combination of three file photos shows, left, then state Auditor General Jack Wagner in Philadelphia on Friday, May 7, 2010. The center photo shows Bill Peduto in a file photo from March, 2005. The photo at right is a 2006 file photo of Luke Ravenstahl, the incumbent mayor of Pittsburgh who is not seeking re-election. (AP Photos/Wagner/Matt Rourke, Peduto-Ravenstahl /Keith Srakocic)

by Joe Mandak
PITTSBURGH (AP) — Mayor Luke Ravenstahl's decision not to seek re-election has given whoever succeeds him an opportunity to shine a national spotlight on a city that continues to reinvent itself as a post-industrial 21st century success story, say political experts and the leading candidates to replace him.

This photo provided by the Pittsburgh Zoo and PPG Aquarium shows the new Amur tiger cub in a restricted area at the zoo. (AP Photo/Pittsburgh Zoo and PPG Aquarium, Paul A. Selvaggio)

PITTSBURGH (AP) — Officials at the Pittsburgh Zoo & PPG Aquarium are showing off their new Amur tiger cub to the public, though the 6-week-old cat can only be seen on a video monitor for now.

A still from an advertisement paid for by Pennsylvanians for Accountability.

 by Bill Heltzel
Pennsylvanians for Accountability runs television ads that accuse Gov. Tom Corbett of playing a shell game with the state.

But what game is the Pittsburgh advocacy group itself playing? It refuses to name its officers and directors. It conceals its funders. It uses a mail drop for an address.