Let’s see… 1972, Democratic National Convention. McGovern came into it with more delegates than anyone else but it wan’t a guaranteed lock. The convention droned on into some horrid single-digit hour of the next morning before finally nominating McGovern, who got his butt handed to him in the general election by Richard Nixon.
Four years prior to that, also the Democratic National Convention… Chicago. Holy Shit. The candidate who had really been on a roll, Robert Kennedy, had been assassinated. The incumbent, Johnson, was not running. The anti-war candidate Eugene McCarthy was the anti-establishment favorite. It was all up for grabs, and the streets filled with politically active young folks and then the Chicago cops who were sent out to roust them, and the reporters. One giant freaking disaster, with the lackluster Hubert Humphrey coming out of it all with the nomination for no particular reason that anyone could discern.
Since then, no conventions where the outcomes were in doubt as far as I can recall, (and from the above you can’t blame the major parties for not having much nostalgia):
76, Jimmy Carter had the Dems locked up and Ronald Reagan had failed to put any serious dent in incumbent Gerald Ford’s momentum, so no suspense there either.
80, Carter had no discernable opposition and Reagan had trounced the other Republicans early and often.
84, I’m pretty sure that Mondale had the Dem votes locked up long before the Cal primary and the convention, and took the Dem nomination only to lose to incumbent Ronald Reagan who had no serious opposition in the Pubbie primaries.
88, Once Joe Biden had shot himself in the foot with a plagiarized political speech and withdrew, (Gary Hart had shot himself in the scrotum a few months before the primary season), Mikey Dukakis became the frontrunner. Jesse Jackson, Al Gore, and Dick Gephart did not acquire enough votes to keep it from being a Dukakis coronation event. George HW Bush had no significant oppostion among the Republicans that I can recall.
92: Bill Clinton “the comeback kid” caught and passed the other Dem candidates and owned the nomination by the end of the season. No serious Republican challenge was given to George “read my lips” HW Bush, who was renominated to lose to Clinton.
96: No Dem opposition to Clinton, and Bob Dole was anointed by the Republicans long before the Republican convention to go up against him.
00: Gore pretty well mopped the floor and owned the Democratic nom early; the Republican nom was more closely contested than expected at first (a GWBush anointment was expected among the Pubble leadership); but Bush turned back McCain and the outcome of the convention was well-known before the first balloon was filled with helium.
Anyone with better info feel free to correct me wherever I’m wrong.