Today’s good news is that Barack Obama has agreed to come to Copenhagen en route to Oslo to pick up his Nobel Prize. Obama has already said no treaty will emerge from the talks, but it’s a useful sign that he’s felt real pressure to attend. Now, more strongly than ever, we need to highlight the requirement for real American leadership–not just rhetoric, but strong action. That’s why we’re urging people to hold candlelight vigils at American embassies and consulates, and at U.S. senatorial offices, on the weekend of Dec. 12. Because, of course, the real issue is what he’ll do when he gets back to Washington.