They're called "dream tickets" because teaming top rivals is seen as a way to unite the party, and the Kennedy-Johnson ticket generally is cited as a model. This year, buzz centers on whether Obama will pick New York Sen. Hillary Rodham Clinton, the Democratic rival who ended her primary campaign Saturday. A website called VoteBoth.com, boosted by Clinton supporters, promotes the idea.

"If Obama is this year's JFK, is Hillary Clinton this year's Lyndon Johnson?" asked Bill Galston, a top aide to Mondale in 1984. Like Obama, Kennedy ran on a message of generational change, Galston noted, and yet tapped the most powerful representative of the Democratic establishment as his running mate — and someone the Kennedy clan didn't particularly trust or like.

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