Have you heard of Senate Bill 1959, known also as the Violent Radicalization and Homegrown Terrorism Prevention Act of 2007?
Here are the full details
Think un-American activities commission and you begin to get the gist of what it is, except this bill goes much further and has the scope to criminalize thoughts.
I expect this bill wishes to criminalize political Islam within the United States, but the trouble is the bill is so broadly worded as to criminalize whatever whim strikes those with the power to enforce it.
Perhaps some examples...
If Mitt Romney becomes president and decides non-Mormon Christians are radical then they would be arrested.
If Hillary Clinton becomes president and decides Norman Podhertz has a "radical agenda" then he would be arrested.
If Rudolph the red-nosed Giuliani becomes president and decides that gun owners are "adopting an extremist belief system" then they would be arrested.
If Ron Paul becomes president and decides that democrats are "trying to coerce the civilian population of the United States in furtherance of political objectives" then they would be arrested.
Is it wise to give that much power to people that crave it as cravenly as politicians?