It Makes me sad to hear this
Being from north of the border (read Canada) I am on the outside looking in to the American dynamic. Now being confronted for taking a photo of a Government building of both historical and architectural signifigance, makes me sad that some people have given into fear of terror that much. To my knowledge there is no law in the US on a Federal level and I know for certain in Canada that its against the law to shoot a goverment building. Unless it has become a copyright issue.