(CBS) A federal indictment alleges that Vice President Cheney's now-former chief of staff I. Lewis "Scooter" Libby committed perjury during, among other things, a conversation he had with Time magazine reporter Matt Cooper. Cooper says he's not so sure. Libby resigned Friday after he was indicted by a grand jury, accused of obstructing its two-year investigation of the outing of CIA agent Valerie Plame and lying about an effort to blow Plame's cover. Special prosecutor Patrick Fitzgerald said the CIA leak investigation is substantially complete, though "it's not over." Fitzgerald wouldn't comment about the possible involvement in the case of...