Just like the 2016 Brexit campaign, Obama's intervention may well have backfired. In April 2016, just months before he was due to leave the White House, then-U.S. President Barack Obama travelled to London, England to engage in a far shadier attempt at “foreign intervention” in another country’s election process than Donald Trump was ever party to. Arriving in London, he told an audience that Britain would find herself “at the back of the queue” for a trade deal with the United States if the public insisted on voting to leave the European Union. At that point in the campaign, the...