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boston marathon bash on ricin _00003520.jpg
boston marathon bash on ricin _00003520.jpg

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    Letter to Obama tests positive for ricin

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Letter to Obama tests positive for ricin

CNN's Dana Bash explains how the White House is reacting after a letter containing poison was sent to the president.

Letter to Obama tests positive for ricin

CNN's Dana Bash explains how the White House is reacting after a letter containing poison was sent to the president.