probably not much at all.
There's negotiation to be done, staking out territory (one hopes. veeps should do something).
They may not have spoken, but I'd wager Clark could give you cold what Obama would say, on any number of issues.
Yeah, I would agree, I think the probably both know either others views very well.
I also think perhaps the "they have to feel comfortable with each other" idea is a little overblown.
These are two of the smartest people in politics, both pros.
If it makes sense for the ticket, and if I was Wes Clark, I would want to know what role I would play in an Obama Whitehouse, they will be friendly enough.
... negotiating gets done first, less squabbling later.
Obama is known to be a compromiser, someone who likes diverse ideas. He's got a lot less to worry about than other personality types (who might want to find values-partners, or people who would take the same approach to problem solving).