If you are the status quo candidate in a change election in which the national mood is sour and two-thirds of the electorate think the country is on the wrong track, what do you do? Attack. Relentlessly. Paint your opponent as extremist, volatile, clueless, unfit, dangerous. Indeed, Hillary Clinton's latest national ad, featuring major Republican politicians echoing that indictment of Donald Trump, ends thus: "Unfit. Dangerous. Even for Republicans."

The president of the United States lands with all the majesty of Air Force One, waiting to exit the front door and stride down the rolling staircase to the red-carpeted tarmac. Except that there is no rolling staircase. He is forced to exit -- as one China expert put it rather undiplomatically -- through "the ass" of the plane.

The one great service of Donald Trump's extended peregrinations on immigration policy is to have demonstrated how, in the end, there's only one place to go.

Bernie Sanders never understood the epic quality of the Clinton scandals. In his first debate, he famously dismissed the email issue, it being beneath the dignity of a great revolutionary to deal in things so tawdry and straightforward.

This week Russian bombers flew out of Iranian air bases to attack rebel positions in Syria. The State Department pretended not to be surprised. It should be. It should be alarmed. Iran's intensely nationalistic revolutionary regime had never permitted foreign forces to operate from its soil. Until now.

You may be thrilled by the feats of Katie Ledecky, mesmerized by the grace of the women gymnasts, startled by Rio spectators mocking U.S. soccer star Hope Solo with chants of "Zika! Zika!" (the first recorded instance, noted one wit, of a stadium rocking to the invocation of a virus). Allow me, however, to interrupt the prepackaged, heart-tugging, tape-delayed Olympic coverage to bring you the real sporting news of the year.

Donald Trump, the man who defied every political rule and prevailed to win his party's nomination, last week took on perhaps the most sacred political rule of all: Never attack a Gold Star family. Not just because it alienates a vital constituency but because it reveals a shocking absence of elementary decency and of natural empathy for the most profound of human sorrows -- parental grief.

"The best darn change-maker I ever met in my entire life." So said Bill Clinton in making the case for his wife at the Democratic National Convention. Considering that Bernie Sanders ran as the author of a political revolution and Donald Trump as the man who would "kick over the table" (to quote Newt Gingrich) in Washington, "change-maker" does not exactly make the heart race.

The main purpose of the modern political convention is to produce four days of televised propaganda. The subsidiary function, now that nominees are invariably chosen in advance, is structural: Unify the party before the final battle. In Cleveland, the Republicans achieved not unity, but only a rough facsimile.

"The most significant reinforcement of our collective defense any time since the Cold War," President Obama called it. A bit of an exaggeration, perhaps, but it was still an achievement: Last week's NATO summit in Warsaw ordered the deployment of troops to Eastern Europe, the alliance's most serious response yet to Russia's aggression and provocations on its western frontier.