PORTLAND, Ore. -- A federal judge in Portland, Ore., has sentenced a man to two years in prison for sending threatening letters laced with a suspicious powder to members of Congress, journalists and comedians Jon Stewart and Stephen Colbert.

Christopher Lee Carlson apologized Wednesday, telling the judge he was, as he put it, not right in the head.

The 41-year-old Vancouver, Wash., man pleaded guilty in October and faced a maximum of five years in prison.

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Prosecutors sought a three-year sentence. Judge Michael Simon went a year less because Carlson is a first-time offender and has been diagnosed with bipolar disorder.

Carlson mailed more than 100 envelopes that contained a mixture of celery salt and corn starch.

The letters alarmed congressional offices in Washington, D.C., and field offices across the country.

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