I've covered the Republican presidential debates in this space while mostly neglecting the Democratic debates for the simple reason that foreign policy is apparently not something Bernie Sanders wants to emphasize. And, for some reason, the debate moderators have proved supremely uninterested in asking questions about the one issue a US President has virtually total power over. This time, however, it did come up, and what happened on that stage in Florida underscores the limited but very real differences between the Clintonian and Sanderista wings of the party. It also illustrates the weaknesses of Clinton's position, if, as expected, she wins the nomination and goes into the general – weaknesses that will only be manifested if she's up against Donald Trump instead of some routinely interventionist Republican.

I'll note, first of all, that Clinton was silent when Sanders attacked her on her Libyan adventure, which everyone but her acknowledges turned out to be a disaster on a par with Iraq. Here's what he said: