Saddam Hussein.
They helped sell the Bush Administration’s war to a fearful public, and nearly every single one of their predictions turned out to be untrue: Saddam did not have stockpiles of weapons of mass destruction; Americans were not greeted as liberators; the insurgency was not in its last throes; rebuilding Iraq would cost more than $1.7 billion; Iraq did not help al-Qaeda attack the U.S. on 9/11, and the mission was not accomplished by May 2001.
Did any of these notable figures lose their job or leave their post in shame? No, they continued in their careers or received eventual promotions either in the media or in government.