Johnson was talking politics with the "Morning Joe" crew when regular guest Mike Barnicle shifted gears.

"What would you do, if you were elected, about Aleppo?" Barnicle asked.

"About?" Johnson replied.

"Aleppo," Barnicle said.

"And what is Aleppo?" Johnson asked.

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A beat. "You're kidding," Barnicle replied. "No!" Johnson said, prompting Barnicle to explain that Aleppo is a city in Syria that epitomizes the country's refugee crisis and has seen some of the worst horrors of its civil war. But ... you probably knew that.

Johnson is running for president on the Libertarian Party line. He's a noninterventionist. Once he got his bearings (perkily replying "Got it!" to Barnicle's explanation), he suggested that the Syria problem was a function of American "regime change" efforts (presumably because of the instability in Iraq) and that the best way forward was to partner with Russia.

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Host Joe Scarborough pressed Johnson on his whiff.

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"So Aleppo is the center of a lot of people's concerns across the planet about the terrible humanitarian crisis that is unfolding not only in Syria, but especially in Aleppo," Scarborough said. "You asked, 'What is Aleppo?' Do you really think that foreign policy is so insignificant that somebody running for president of the United States shouldn't even know what Aleppo is, where Aleppo is, why Aleppo is so important?"

"No," Johnson replied, fumbling a bit. "I do understand Aleppo and I ... understand the crisis that is going on. But when we involve ourselves militarily, when we involve ourselves in these humanitarian issues, we end up — we end up with a situation that in most cases is not better, and in many cases ends up being worse."

The most generous way to view Johnson's performance is that, in the moment, he blanked on the word. They'd been talking about whether he was going to be 2016's Ralph Nader (that is, a spoiler), then Barnicle comes out with the Aleppo thing. Maybe he simply didn't change tracks fast enough. (A writer for Fusion points out that he has done this before, at one point asking an interviewer, "Who's Harriet Tubman?")

That's a very generous way to look at it, and hardly one that smooths this over for the candidate. Aleppo is a critical component of the current debate over foreign policy and something with which most Americans, and certainly a presidential candidate, should be familiar.

Bombing on "Morning Joe" (so to speak) is not — and should not — be fatal to a serious presidential candidacy. But Johnson doesn't get many opportunities on the national stage, thanks to his outsider status — and this opportunity, it seems safe to say, was a missed one.