McCain Camp receiving threatening letters? Freedom of Speech or Terrorism?

A recent article found at CNN.com makes mention of threatening letters being received at the McCain Camp, do you feel that there is a right to send such things or is it illegal. To also note that in part one of the two letters contained some sort of powder. Does that make it any different? Discuss @ Home Of Knatchwa Forums share your view. And further information can also be found in the Elections 2008 area of the forums.