Invoking the specter of Israel's 1981 strike on Iraq's Osiraq nuclear reactor, Vice President Dick Cheney vowed Sunday that the U.S. would stop Baghdad from obtaining nuclear weapons. "I think it would be a great tragedy if Saddam Hussein were to acquire nuclear weapons," Cheney told NBC's "Meet the Press." "The president has been very clear that we will do everything we need to do to make certain that doesn't happen." Cheney recalled Israel's preemptive strike 21-years ago on the Osiraq reactor, which temporarily halted the Iraqi nuclear program. "We do know that he was working on it back in...