I would never attack somebody only because they belong to a different party.

We are in the middle of a tough, ideological conflict that is being waged across the entire continent. On the one side are those who say that global challenges like migration and terror cannot be met with national parochialism. On the other side are those who would like to see a renaissance of the nation-state.

Primary responsibility for Brexit lies with British conservatives, who took an entire continent hostage.

It was a Russian airplane that was bombed over the Sinai Peninsula. When the Russians conduct air strikes on IS, they are doing so because they too are threatened by terror.

It became obvious that we had completely failed to impose rules on unbridled speculative capitalism. That destroyed financial systems, hollowed out state systems and deeply shook German social stability. Can you recall the debate about "locust" hedge funds - even if it's a terrible term. The speculator capitalists roamed the land, stealing the substance from companies and throwing away the shells. And we were powerless.

The membership survey was a great moment for inner-party democracy. We can't go back, nor do we want to. Our members are pouring their hearts into this campaign. But people don't join the Social Democrats party just to put up posters. They join because they want to help steer the party.

My worry is that Donald Trump may inspire copycats, also in Europe. That's why I hope Hillary Clinton wins.