Pure evil. There's no other word for it.
But Democrats are evil, so no surprise there (or at least the Obama-Pelosi-Reid Democrats are evil, and their base, folks who are working their hardest to destroy America).
Inside Job: More Than Half of Democrats Believed George W. Bush Was Complicit in September 11 Attacks
It's the mother of all conspiracy theories. As Ben Smith reports, in 2006 a majority of Democrats believed President Bush had a hand in the September 11th attacks, "More than half of Democrats believed Bush knew" (via Memeorandum).