Aren't you a citizen of the US? If you are, then why not just start it yourself, instead of wishing?
Also, there IS a Pirate Party for the US: http://www.pirate-party.us/news.php
Also, there IS a Pirate Party for the US: http://www.pirate-party.us/news.php
But it's an interesting question: if you want a certain type of political change are you better off forming a crazy extremist group or a modest mainstream one?