Wolf Blitzer delivers the most important news and political stories of the day. Tune to The Situation Room weekdays 5-6:30pm ET on CNN.
A letter addressed to President Obama might be related to the laced letters sent to NY Mayor Bloomberg.
RELATED STORY: Letter to Obama intercepted; similar to ricin-laced letter to Bloomberg
CNN's Sanjay Gupta explains ricin and how deadly the poison can be.
RELATED STORY: Ricin scare rattles Washington
A suspicious letter containing ricin, a poison, was addressed to a senator, according to sources. CNN's Dana Bash reports.
The Situation Room with Wolf Blitzer is the command center for breaking news, politics and extraordinary reports from around the world. Tune in weeknights from 5-6:30pm ET on CNN.
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