SAN FRANCISCO —  A federal appeals court Friday overturned an inmate's conviction for writing a crude, rambling letter endorsing President Bush's death at the hands of terrorists — two weeks after the Sept. 11, 2001, attacks.

The letter from Oregon State Penitentiary prisoner Jonathan Lincoln (search), who was charged with threatening the president and given an 18-month sentence last year, read, in part: "You will die too George W Bush real Soon they Promised That you would Long Live Bin Laden."

Corrections officials intercepted the letter; Lincoln had been serving a 46-month sentence for robbery.

A unanimous three-judge panel of the 9th U.S. Circuit Court of Appeals (search) said the letter was protected under the First Amendment, calling it "Lincoln's crude and offensive method of stating a political opposition to the president." The court noted "such political hyperbole does not constitute a 'threat."'

The decision reversed a ruling by Judge James A. Redden (search), who tried the case without a jury. Redden ruled the letter constituted a "true threat" when combined with statements Lincoln made six months earlier to a Secret Service agent that he wanted to assassinate the president.

Lincoln's attorney, Michael Levine, said his client was mentally disabled. He was released from prison last month and lives in a Portland, Ore., halfway house.

Frank Noonan, the Justice Department attorney who prosecuted Lincoln, did not immediately return calls for comment.