Quinnipiac are often poll pushers.
There are a reputable firm, however, it’s worth noting that the Quinnipiac poll used a sample of “regular voters”. In every other recent poll, Toomey is ahead, and those polls use a sample of “likely voters”, which is a much more realistic model - especially for a midterm election where only the more motivated voters turnout.
“Strong position” is a bit of spin considering Specter has been trailing in every other poll for months. Now all of a sudden one dubious poll shows him gaining ground in just the last week or two. That is hardly strong, even if he is doing better. And 7 points is hardly insurmountable. No one thought it would be easy to dump a long time senator in a Demo leaning state.