Well, 1988 was pretty weak:
Michael Dukakis, Jessie Jackson, Al Gore, Paul Simon (not that Paul Simon), Dick Gephardt, and Gary Hart.
1972 was a bit better but quite an eclectic mix of:
George McGovern, Hubert Humphrey, George Wallace, Edmund Muskie, and Shirley Chisholm.
1992 brought us Bill Clinton, Jerry Brown, Paul Tsongas, Tom Harkin, and Bob Kerrey.
Eyeing and "Ready to Report for duty," taking a page from John Kerry no doubt.