In 2008, Hillary Clinton said, "The buck stops in the Oval Office."
Indeed, Clinton made the statement in direct reference to whether Barack Obama would be an effective president. (At the time, she said he wouldn't be an effective president.) As the New York Daily News reported at the time:
Hillary Clinton to Barack Obama: You don't get what it takes to be an effective President. … The nation's faltering economy was the backdrop yesterday in the Democrats' clash over what the presidency entails. "I know that we can get on top of this, but it's going to require strong presidential leadership - it's going to require a President who knows from day one you have to run a government and manage the economy," she said. "The buck stops in the Oval Office."
The quotation is particularly interesting now, since Clinton said Monday evening that the "buck stops with her" in regard to the terrorist attack last month in Benghazi, Libya.
That attack, carried out by al Qaeda, left four Americans dead, including the ambassador to Libya, Chris Stevens.
Over a month after the 9/11 attack, the facts of what happened--when, where, and how--are still not yet entirely clear.