Letters Tainted with Ricin Sent to President Obama, Congress

Aired: 4/17/2013 | 0:06:12 | Clip
In aftermath of the attack in Boston, letters sent to President Obama and members of Congress tainted with the poison ricin were intercepted by authorities before delivery. Hari Sreenivasan talks with WNYC's Todd Zwillich, who says the potential scare has many edgy especially on such an unusual day on Capitol Hill.