In it, but not of it. TPM DC
The previous Research 2000 poll of this race was from all the way back in August 2009, and had Specter ahead of Toomey by 45%-40%. This was shortly before Specter began to trail Toomey in most polls, so there isn't enough data from this pollster alone to establish a definite trend.
However, it should be noted that this result is very close to a recent Quinnipiac poll, which showed Specter taking a 49%-42% lead over Toomey after having previously trailed in their polls after the last few months. So it's quite possible that Specter's numbers could be coming back.