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).
