LONDON ACROSS AMERICA today Senator Edward Kennedy is rightly mourned as one of America’s greatest advocates of social justice. Around the world he is mourned as a great internationalist who inspired social progress in every country.

Northern Ireland is today at peace; South Africa is free of apartheid; more children not only in his nation, but in the poorest nations, are going to school and have health care. We owe a great debt to the vision and courage of Ted Kennedy.

I was fortunate to get to know Ted years ago. He invited me to Cape Cod during a number of summers in the 1990s. Almost immediately, even as he masterfully navigated us around the Cape in his boat, our discussions focused on what America and Britain could do together to tackle the scandal of child...