They want to establish an "amirate" in America. But check out the FATWA ON VOTING where they say Muslims should not work within the system to do this. And they don't want to share power either.
"The Islamic system cannot co-exist with any other system. As a comprehensive package, Islam must exist on its own platform that will enable it to cover all aspects of life. The notion of reform has no place in Islam because Islam did not come to establish itself in pieces that can be used to cover the wounds of an already dead society"
Without mentioning violence, this web site, www.amirate-america.org, makes the case for a takeover of America and also says not to do it through the political process. What does that leave? I doubt that they are going door-to-door to try and convert people to Islam.