U.S. News rumor guy Paul Bedard:
But if you want a really juicy rumor, consider who some key Democrats want for Sen. Barack Obama's No. 2: his veep search aide, Caroline Kennedy. While many Democrats we talked to dissed the idea of a two-minority ticket, others feel it would boost the generational shift Obama represents. And, adds one fan of the idea: "Caroline is the good Kennedy." There's recent precedent. President Bush picked his vice presidential search team leader, Dick Cheney.
I don't know what to say about this. It'd be cool, but I can't help but to think that it's very unlikely.
(h/t Paddy)