WQED has come up with an idea that initially might make some public broadcasters cringe: an entire multichannel fully devoted to fundraising. Yes, all pledge shows, running 24/7. That’s exactly what WQED Showcase will be. The Pittsburgh station will debut its fourth channel possibly as soon as November. Station President Deborah Acklin came up with the concept for the potential revenue stream, which appears to be a pubcasting first.