Well, there are certainly passages in the Quran that promote violence.
http://www.thereligionofpeace.com/quran/023-violence.htmThere you go, I don't see how you can deny that. What's terrible about Huckabee here is that he seems to be painting the Muslims as possessing a type of inherent violent nature. Surely, Huck would never point to some of the more disgusting Bible verses and try to say that Christians promote violence.
There are far too many people on the planet that would like to say that we are in a worldwide struggle between the forces of Christianity and Islam. Huck, you stupid bastard, you are not helping.