Hillary Clinton has a secret weapon. His name is Barack Obama.

Hillary Clinton is crushing Donald Trump. In the latest ABC News/Washington Post poll, she thumped Trump 51 percent to 39 percent among registered voters nationwide. That's an almost inconceivable 14-point swing in the Democrat's favor since May.

But maybe we shouldn't be surprised. Trump is barely even contesting the election, at least when it comes to the traditional fields of political combat. Last week, for example, it came out that he was running literally zero campaign ads in several swing states. The reason? His campaign is practically broke. It's unprecedented for a major party nominee to basically not campaign. Is it any wonder Trump has resorted to crowing about polls in which he's only losing narrowly?

Of course, there's no guarantee this dynamic will last. Maybe Trump will get his act together and stop behaving like a silage-addled steer. Maybe the economy will crater and Trump will exploit it. Maybe Republicans will somehow oust him at the convention.

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But even if these things happen, and Clinton's healthy lead over Trump dwindles, we shouldn't forget the final and most powerful advantage Clinton will have: President Obama.

No sitting president in modern times has ever campaigned at full strength for his party's nominee. George W. Bush was persona non grata on the campaign trail by 2008. Bill Clinton was seen as damaged goods by Al Gore in 2000, who distanced himself from the Clinton name (despite the 42nd president's tremendous popularity at the time). Ronald Reagan was already elderly in 1988 and did not have a great relationship with George H.W. Bush. LBJ quit politics altogether in 1968. Eisenhower did campaign a bit for Nixon, but he was also old by 1960, and avoided much of the campaign.

President Obama, by contrast, is still quite young (indeed, he is 14 years younger than Clinton herself), and by all accounts is eager to help Clinton, who represents the best chance of preserving his legacy. Any lingering sense that a soon-to-be former president should refrain from campaigning to preserve the dignity of the office is utterly dead. And as he finishes his presidency, Obama is more popular today than he has been since the bin Laden raid — part of an upward trend that shows no sign of slowing.

The economy is doing reasonably okay, particularly compared to several years ago, and as Obama himself is not running for re-election, some of the partisan hatred has passed to Clinton. But perhaps more importantly, Obama's personality is extraordinarily well-suited for this political moment. Like him or hate him, you have to admit that he is even-keeled almost to a fault. Always cool, always considered, Obama never flies off the handle and rarely expresses any emotion aside from a wry humor. In a chaotic world, Obama is a reassuring presence.

Sometimes that leads to grotesque immorality, as when he flippantly disregarded the legal obligation that torturers be prosecuted. But when instability is breaking out everywhere, and things are developing fast — like, for example, when the U.K. has just voted to leave the European Union, precipitating a financial panic, and potentially auguring the crackup of the eurozone and the U.K. itself — it's nice to know that the president is always going to keep his icy cool.

This kind of clamor and chaos seems to be happening every other week in 2016. Even aside from the horrifying spree killings and endless war in the Middle East, the tectonic plates of politics in Western nations are crumbling. Open bigotry and ethnic nationalism are making huge political inroads, and pointless austerity has badly damaged or destroyed the political establishment in many countries — Spain, to pick one example out of many, just had its two hung parliaments after not a single one since the end of the Franco dictatorship.

A deranged maniac is about to become the official presidential nominee of the Republican Party. It seems a safe bet at this point that Trump is not going to discover some inner reservoir of quiet intelligence. He's a hair-trigger showboating ignoramus to the bone. And as the campaign goes on, and Trump says goofy, alarming nonsense in response to one crisis after another, Obama's quiet, competent reserve is going to look increasingly appealing.

Hillary Clinton will only benefit partially from this, of course. She simply does not have Obama's unflappability. But she'll gain much by simple association with Obama's extreme chill, and can only benefit by contrast with Trump's extreme capering. Should she win in November — particularly by a large enough margin to take back the House of Representatives — Obama can claim a large share of the credit.