A couple questions and a poll: is it possible that Clark would run with Hillary Clinton? I see it as doubtful, because it's not the uniting strategy, and she can use some time to craft a clear political persona.
I'm also interested in the hypothetical case of it happening anyway, and wondering if it could possibly play well on election night. Hillary is still polarizing, and she doesn't have a clear political identity to counter act that. Even people that might not vote against her specifically would see nominee in a different light. Hillary still needs to define herself as more than first lady, part term Senator, attorney, and chickling hawk.
Assume Clark is the nominee for the purposes of understanding "could happen"/"would happen"