The Vatican's timing was ironic. While Roman Catholic bishops in the U.S. were trying to revive their moral and political clout last week by battling President Obama over contraception coverage and religious liberty, a papally endorsed symposium was underway in Rome on how the Church has to change if it wants to prevent sexual abuse crises, the very tragedy that has shriveled the stature of Catholic prelates worldwide over the past decade, especially in the U.S. One monsignor at the Vatican gathering even suggested the hierarchy had been guilty of "omertà," the Mafia code of silence, by protecting abusive priests.The Roman forum was a reminder -- and the birth control clash is turning out to be one as well -- of just how much influence the U.S. Conference of Catholic Bishops has lost in the 10 years since the abuse crisis erupted in America. It hopes that its protest of a new federal rule requiring religiously affiliated institutions like Catholic hospitals and universities to provide no-cost contraception in their health insurance coverage, even if church doctrine forbids birth control, will help restore the bishops' relevance. They did win a partial victory last Friday when Obama, acknowledging the uproar, said those institutions would no longer have to pay for the contraception coverage themselves. But the President did not fully genuflect: The compromise will still oblige religious-based employers to offer the coverage, while their insurance providers foot the bill.