Not yet, but considering where he was this Spring, it's cause for major cheers.
His numbers ringing at 44 percent are by no means healthy, but the fact that Casey only leads by three is encouraging. Excepting Gallup, the last 5 polls from PA had Casey pegged bewteen 44 and 48 percent, so 47 percent is not out of line. The difference here is that Santorum's numbers, which had been running about 39-42 percent have jumped a couple of percent (which could be explained by the debate)