Is it illegal for a U.S. government worker to put a presidential sign in his/her front yard?

My friend works for the United States department of agriculture, he thinks he could get in trouble for putting a McCain or Obama campaign sign in his front yard. Could you please find me a legitimate web site that proves it is obviously legal to have the sign in his yard. Or just prove your answer how ever you'd like. show more My friend works for the United States department of agriculture, he thinks he could get in trouble for putting a McCain or Obama campaign sign in his front yard. Could you please find me a legitimate web site that proves it is obviously legal to have the sign in his yard. Or just prove your answer how ever you'd like.
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