<span>Moveon.org and Americans for Prosperity are both advocacy groups. While each is at opposite ends of the liberal-conservative spectrum, they both have a common purpose. Each strives to educate the public in a manner that will gain support for their political ideology.</span>
States cannot force associations to accept members
They are more free as they used to be affected by communism :)
It is important for the citizens to have a democracy having more than one way to participate in government and politics because it only means that there are more opportunities for one's voice to be heard and have the right to choose who or what parties they wanna pursue.