By Bill Mears, CNN

(CNN) – Montana’s chief federal judge has offered his apologies for forwarding a racist e-mail aimed at President Barack Obama. Liberal advocacy groups demanded that U.S. District Judge Richard Cebull to resign.

Cebull, in an interview Wednesday with the Billings Gazette newspaper, offered his regrets for forwarding the e-mail, saying it was “a hard lesson to learn.”

“To say it’s inappropriate and stupid is an extreme understatement,” according to the newspaper. “There is no doubt it’s racist. It wasn’t forwarded for that purpose. If anything, it was political.”

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