From the Post-Gazette Early Returns blog:
Altmire poll: Up 24 over Critz
A poll memo released by McCandless Democrat Jason Altmire's campaign claims he has a 24-point lead in PA12 over Johnstown Democrat Mark Critz, a jump of 8 points from a 16-point lead in January.
The jump was driven in part by the Critz camp's legal challenge of Altmire's nominating petitions, which the memo claims turned off voters in the district north and east of Pittsburgh.
The live survey of 400 likely Democratic voters was conducted March 12-14 by Anzalone Liszt Research and has a 4.9% MoE.
Read the full post at Early Returns.