Dan posted a link which illustrates why any party mission statement is nothing more than a glorified marketing campaign. I don't think it got the attention it deserved, so I'll post the mission statement of the Democrats, Republicans to show how meaningless it really is. I'm sure you can see the hypocrisy in each:
Democratic Party
"The Democratic Party is committed to keeping our nation safe and expanding opportunity for every American. That commitment is reflected in an agenda that emphasizes the strong economic growth, affordable health care for all Americans, retirement security, open, honest and accountable government, and securing our nation while protecting our civil rights and liberties."
Republican Party
"Republicans have a long and rich history with basic principles: Individuals, not government, can make the best decisions; all people are entitled to equal rights; and decisions are best made close to home."
Now, with that hypocrisy fresh in your mind, simply extrapolate:
Tea Party
"The impetus for the Tea Party movement is excessive government spending and taxation. Our mission is to attract, educate, organize, and mobilize our fellow citizens to secure public policy consistent with our three core values of Fiscal Responsibility, Constitutionally Limited Government and Free Markets."