I'm sure that's why she was an "unscheduled speaker" at the March Sunday - she's keeping her name out there in case Kerry does implode. As soon as I heard her voice (on the radio that night) I was absolutely certain she was going on the ticket, either top or bottom.
Does anyone else recall hearing the rumor/gossip a bit back that Clinton wanted Hillary on the ticket with Kerry, and if Kerry wouldn't comply, Clinton would bring his book out in time to overshadow the convention?