Hillary Clinton: "It has to be continued threat from the spread of nuclear weapons, nuclear material that can fall into the wrong hands. I know the terrorists are constantly seeking it. That's why we have to stay vigilant. Also united around the world to prevent that."

Translation: I'm still the one who is ready for the 3 am phone call.

What this says about Clinton: It at first sounded like Clinton was ready to take a bravely Reaganesque stand for global abolition of nuclear weapons, but it turned out she was going to make a politically canny but ultimately unhelpful easy answer. Who could possibly disagree that a nuclear-armed terrorist would be scary and bad? At the same time, unlike Syria or Russia policy, there is no contentious political fight or policy deadlock on this. And it has the merits of being specific enough to be a tough-sounding answer specific to national security. So she gets to sound like the tough candidate, and the one who will be hard-nosed on security threats — it's a sort of throwback to her 2008 campaign ad about the 3am phone call — without actually taking any sort of difficult policy positions.

Bernie Sanders: "The scientific community is telling us, if we do not address the climate change, transform our energy system away from fossil fuel, the planet we'll be leaving our kids and our grandchildren may well not be habitable."

Translation: I am not a foreign policy candidate, I am a social justice candidate.

What this says about Sanders: He hasn't really emphasized foreign policy in his campaign, and has appeared at times shaky on it. So it makes sense that he wouldn't treat this as a foreign policy question at all, but rather would use a wider definition of "national security threat" that includes climate change, which in policy terms is certainly sound. Depending on your view of Sanders, this was either a way to dodge a question that was probably intended to be about foreign policy, or it is Sanders showing us that he's different, that he takes into account larger issues and how they affect Americans.