Insights into Obama's decision not to follow through with military action against Assad

In August of 2012, Barack Obama made a statement that Bashar al-Assad’s use of chemical weapons would constitute a “red line.” When Assad’s army killed more than 1,400 people with sarin gas one year later, the president initially believed that he would carry out a strike. Atlantic national correspondent Jeffrey Goldberg takes us inside the day that Obama broke with the Washington playbook with his last-minute decision not to bomb Syria