How the Sept. 11 attacks would shape Biden's presidency

AP2001

FILE - In this Sept. 20, 2001, file photo Sen. Ted Kennedy, D-Mass., left, and Sen. Joe Biden, center, stand by as Sen. Barbara Mikulski, D-Md., in orange parka, joins in prayer with rescue workers at the site of the World Trade Center in New York. They were part of a delegation of Senators that traveled by train to New York to view the rubble that once was the World Trade Center. The terrorist attacks that day shattered Americans sense of security and ushered in a new era of nebulous threats, hidden enemies and a seemingly never-ending war on terror. And for then-Sen. Joe Biden they marked a new phase of his public life. (AP Photo/Mike Albans, Pool, File)