Okay, it's not a very originalhedder, I'm sure. But it's not easy to come up with something new on the worst-kept secret in Christendom: Tony Blair has swum the Tiber. His reception by Cardinal Cormac Murphy-O'Connor at Archbishops House was warm, though elsewhere it was somewhat hotter, as Amy Welborn reports.Back in May, a London church sourcespokeof Blair's faith in terms of a "baptism of desire." That was when TB was still PM, and stillunderstandably cagy about his intentions, given the religio-political ramifications in officially Anglican England. The source toldthe Times (of London):He is an ecumenical Catholic...He is a liberal Catholic. In terms of his private life, he is a Roman Catholic.