but...
hiv dies once in the air right? Wouldn't the blood be dry and shit by the time it got to Obama?
Yes. Even if someone had handed the President the letter, unless he ate it or fucked it, there was no chance he'd get the HIV. Even if he ate or fucked it it would be smallest chance possible there was still enough viable HIV cells to infect him. The guy has obvious mental issues. I doubt he is charged, but I bet he gets more mental ward time out of this.
This is not the first time law enforcement officials have had to take Hussein into custody. He was arrested by police in 2006 after starting a fire in the middle of a crowded Chicago intersection. When officers arrived on the scene, he was waiving the Koran in the air and yelling "Allah Akbar," or "God is Great" in Arabic. Court documents said he was transported to a hospital, where he called President Bush a terrorist and criticized American foreign policy. He was not formally charged, but he did spend time in the mental health unit of the hospital.

Yes, the guy has mental issues.