Radicalism in the US

Much of my thesis research revolved around radical Islamism in the Middle East, in particular Iran.  However, there is a sort of radicalism in the US as well, and these are radical Democrats.  Not only are they intolerant of the ideas of anyone but themselves, but they give the party a poor name with their intolerance.  Working for Obama from 2005-2007, I had some experience dealing with the idealogies of these extremists.  Much more recently, however, I have been reading a message board/forum sort of site called Democratic Underground- the site advertises itself as a political discussion site, but it is far from just that.  This site produces some of the most narrow-minded Democrats one could possibly think of, people unable to see faults in their own party, and unable to give credit to anyone of the opposition.  Fortunately for America, these radicals are but a small minority of the large Democratic population with realistic goals and open ears.  Let us hope they see the light in this day or the next.