Sen. Jack Reed (D-RI) is highly regarded but not currently a member of the party's leadership team.
"We don't have any titans over there. [Harry] Reid needs to lead," Sestak said.
Sestak spent most of our interview going after Specter, but also portrayed himself as recognizing early that the August town halls were a sign of deep discontent with the establishment from both parties.
He said the lesson from Massachusetts should have been learned last summer. "There's such an unease about the establishment. There's lots of anxiety," he said.
Sestak also said Massachusetts saw "Ben Nelson's hand in the cookie jar," a stinging reference to the Medicaid deal Nelson secured in the Senate health care bill before agreeing he would vote for it.
He said he'd be willing to lose his job over health care, though admitted he would vote for the Senate bill if necessary rather than get no bill at all.
"If we fail shame on us," Sestak said. "The Democrats were given an opportunity to lead, not a mandate."
Sestak did not reserve his criticism for the upper chamber alone, saying that House Democrats are missing leadership skills as well.
He complained that Democrats are briefing members on polls during caucus meetings.
He also said that tax incentives he wanted to see in a jobs will were never included, and said members were given the bill the night before the vote with "no transparency to what really happened" or how the bill was written.