They've done this before:
July 2006 column by Heartland President and CEO Joseph Bast:
The Inconvenient Truth About Al Gore
....I have difficulty taking Gore seriously on environmental issues ever since it was reported that Ted Kaczynski, the murderous “Unabomber,” kept a heavily marked-up copy of Gore’s book, Earth in the Balance, in his tar-paper shack and liberally borrowed from it when writing his anti-humanity treatise. There’s even a Web site (http://www.crm114.com/algore/quiz.html) that offers a quiz to see if you can tell Gore’s words from Kaczynski’s. I bet you can’t.
Was that a cheap shot? Maybe....
The Unabomber also was absolutely sincere in his belief that technological progress was an evil that had to be stopped, with violence if necessary. Fortunately, Kaczynski didn’t have access to the incredible powers of the Presidency of the United States. Unfortunately, Al Gore still aspires to that post.
I'm glad people are taking it seriously, but don't expect it not to happen again so long as this organization is given the time of day. There's a lot at stake, so this repetition of history goes beyond a farce.