Quinnipiac. 4/28-5/2. Likely Democratic primary voters. MoE 3.2% (3/31-4/5 results)
Democratic primary
Arlen Specter (D) 47 (53)
Joe Sestak (D) 39 (32)
DK/NA 14 (15)
Joe Sestak still has significant ground to make up in the final two weeks, but according to Quinnipiac's numbers he's narrowed Arlen Specter's lead by 13 points, from 21 to 8. The Q-poll isn't alone: Muhlenberg UniversityCollege is running a tracking poll which also shows a close race. Their numbers over the past three days have put Specter's lead at 6, 9, and 4 points.
The primary will be held on May 18 and with about 1 in 8 voters still undecided, it's still too early to predict a winner with any degree of certainty.