"I have never run against an opponent that I have respected less," Shays told the New Haven Register after a July 18 debate, then characterized McMahon's performance as "embarrassingly clueless."

McMahon's camp and political analysts have said the recent comments from the well-respect Shays suggest his frustration and realization that his political career might be coming to a close as McMahon holds a significant lead just weeks before the August primary.

"It has become increasingly clear that Shay has become unglued," Murtaugh said. "It's sad to see his career end this way."

A recent Quinnipiac poll shows McMahon leading Shays by 29 points.

Shays, a moderate with support from such Washington Republicans as Karl Rove, appeared to suggest after the debate that he faces long odds in extending his political career, consider the campaign could not afford TV ads - crucial when trailing late and because he has under whelming name recognition despite 21 years in the House.