Tony Blair may be looking increasingly embattled, but he may find some comfort in the fact that one of his leading adversaries is eccentric Labour MP Tam Dalyell, a man who has never been short of lost causes to support. Interviewed on the BBC World Service this morning, Dalyell was at pains to explain that he was not anti-American. His proof? That he was distantly related to Harry Truman. Very distantly, I would say.