Campaigning as Fredo

Someone once described the W administration as the Corleone family if everyone was Fredo. (Anyone know the origin of that one?) The behavioral process is attractive to the base, so the Thompson campaign wants to seize the mantle (is there anyone in the running from either major party better equipped to campaign as Fredo?) and capitalize on that theme. But all that said – I know who Fredo1 is, and I guess Fredo2 is probably Alberto Gonzalez, but can you name the other Fredos, numbers 3 through 7?