Polls of likely Democratic voters released Wednesday by Quinnipiac University and Franklin & Marshall College show challenger Joe Sestak has closed the gap with fifth-term incumbent Arlen Specter.
The primary election is Tuesday.
Barely a month ago, Sestak trailed by 20 points or more in some polls before he began airing TV ads.
The Quinnipiac University survey gives Specter a 44 percent to 42 percent edge. The sampling error margin is 3.2 percentage points. Fourteen percent are undecided.
The Franklin & Marshall survey gives Sestak a 38 percent to 36 percent edge. The sampling error margin is 7.9 percentage points. It shows about one in four are undecided.