Let’s break it down. The entire cast of Saturday Night Live, 40 years of it, ranked from top to bottom. Insanely ambitious? You bet. Absurdly exhaustive? No doubt. Ruthlessly complete? Damn straight. From the Samurai Hitman to the poor bastard who played Walter Mondale. Everybody. So — live from New York — a passionate, definitive, opinionated, subjective, irresponsible and indefensible breakdown