Here’s what we know about how Carlos Allen, the latest White House party crasher, wound up at Barack Obama’s first state dinner: Five days before the event, Allen told a friend that he’d received an invitation from the White House to dine with the prime minister of India. In retrospect, it was an odd claim. Allen wasn’t famous, a big political donor, or Indian. He wasn’t even, it seemed, fully employed. Yet he gave no hint that he was surprised to have been invited. Nor was Allen’s friend surprised to hear it. Allen, she later said, seemed like the kind...