I think that this'll do a little more thinking than the Presidents one... I'll start from 1952 and go on to 2012...
Democratic nominees:1952: Adlai Stevenson IINext: Really? Him again?
Next-to-Next: Who? Another Kennedy? Now if you meant Joe that's understandable, but who?
Next-to-next-to-next: Senate Minority Leader, okay...
1956: Adlai Stevenson IINext: Alright, so now that he's a Senator its a little more realistic, but JFK? Right....
Next-to-next: Senate Majority Leader! Cool!
Next-to-next-to-next: A former Mayor of Minneapolis... Really?
1960: John F. KennedyNext: His VP? He really wanted the Dem nomination, so its likely...
Next-to-next: Senate Majority Whip... Hmmm.... Okay...
Next-to-next-to-next: A junior representative of South Dakota? Right, Right... Oh wait OH SNA-
1964: Lyndon B. JohnsonNext: This guy's VP... Hmm are we expecting an assassination?
Next-to-next: A Senator! Okay... Now I'm tracking...
Next-to-next-to-next: Jimmy WHO? Did you make that up?! And he's a WHAT? STATE SENATOR?!
1968: Hubert H. HumphreyNext: He's still Senator? Okay...
Next-to-next: Now he's a former State Senator... I'm starting to not believe you on this one...
Next-to-next-to-next: A Junior Senator from Minnesota...
1972: George McGovernNext: A mid-term Governor of Georgia... We'll at least you're sticking to this one...
Next-to-next: still Senator of Minnesota... Like this nominee...
Next-to-next-to-next: A representative of Massachusetts... 'hope he's like JFK...
1976: Jimmy CarterNext: Him again... Okay...
Next-to-next: The VP... Okay...
Next-to-next-to-next: The newly elected Governor of Massachusetts... Nice!
1980: Jimmy CarterNext: So we're looking at a VP after a two term'er? Nice!
Next-to-next: He just got booted...
But definitely dream on!
Next-to-next-to-next: An Arkansas attorney general... He's young and a rising star, but there's many rising stars these days...
1984: Walter MondaleNext: Governor of Massachusetts again! Nice!
Next-to-next: another Governor? There's a lot of Governors FYI...
Next-to-next-to-next: A Tennessean? Sweet!
1988: Michael DukakisNext: Wow, he was close to running, he's definitely going to be the next nominee in the future...
Next-to-next: See above...
Next-to-next-to-next: He ran this year, he's likely to run again...
1992: Bill ClintonNext: Well Presidents are always likely re-nominees...
Next-to-next: The VP? Sure, why not?
Next-to-next-to-next: Senator of Massachusetts? Oh not another Massachusetts guy!
1996: Bill ClintonNext: Hope he's not like Mondale was to Carter...
Next-to-next: A vie, not again!
Next-to-next-to-next: A COMMUNITY ORGANIZER? ARE YOU OUT OF YOUR MIND?!
2000: Al GoreNext: The Senator who was almost this guy's VP!
Next-to-next: Still a community organizer.... -_-
Next-to-next-to-next: So he's gonna be re-nominated?
2004: John KerryNext: The keynote speech guy! Heck yeah!
Next-to-next: He's gonna be renom'ed? YEAH!
2008: Barack ObamaNext: So he's a two termer? 'hope he's not like Clinton...
I'm tired right now... I'll do the Reps after I relax more...