Former president Bill Clinton tried to assuage angry Pennsylvania voters during a rally for Democrat Mark Critz in Johnstown Sunday.

"A lot of what people are feeling now is just pure frustration because the ground keeps moving on them," Clinton said, according to the Johnstown Tribune-Democrat. "Let me ask you something. Forget about politics. Think about decisions you made in your life when you were really mad. There's about an 80 percent chance you made a mistake. Isn’t that right?"

Clinton was joined at the rally by Critz and Joyce Murtha, widow of the late Rep. John Murtha (D-Pa.). Critz faces Republican Tim Burns in the race to fill Murtha's seat.

Joyce Murtha introduced Clinton as her husband's friend and "golfing buddy," noting the former president campaigned for his reelection in 2008. "He's back again for Mark Critz, and to make sure Mark continues Jack’s work," Murtha told the crowd of 1,000 people in the Pasquerilla Conference Center.