As for Obama, I'd ask him how he perceives the limits of American power, which humanitarian circumstances would cause him to use military force, how he would consult with allies, and what Samantha Power's been telling him about all these things.

Edwards I'd ask whether he will give his everything to get social and environmental standards into international trade negotiations and use Europe as a partner in this, rather than unilaterally erecting trade barriers.

I'd ask both what they plan to do on global warming and flatly point them to the immorality of the current situation and tell them that America must take up the biggest burden to restore its 'moral leadership' in anything at all.