ROME (AP) — Hard-right commentators, politicians and activists in Europe have uncovered a secret to expanding their influence: engaging with Elon Musk. Take the German politician from a party whose own domestic intelligence agency has designated as extremist. Her daily audience on X surged from 230,000 to 2.2 million on days Musk interacted with her posts. She went on to lead her party to its best-ever electoral showing. Or the anti-immigration activist in Britain, who was banned from Twitter and sentenced to 18 months in prison for contempt of court. Since Musk let him back on the platform in late...