For the third presidential election in a row, the foreign hacking of the campaigns has begun in earnest. But this time, it’s the Iranians, not the Russians, making the first significant move. On Friday, Microsoft released a report declaring that a hacking group run by the intelligence unit of Iran’s Islamic Revolutionary Guard Corps had successfully breached the account of a “former senior adviser” to a presidential campaign. From that account, Microsoft said, the group sent fake email...