The American Political Science Association has developed a number of valuable resources for undergraduate students who are interested in a Political Science major. An overview of the major and tips for high school and undergraduate students can be found at Majoring in Political Science.
You can find more information about the types of careers Political Science major pursue at Career Sectors.
While there is a considerable amount of information at Career Resources, the most valuable APSA career publication is now available online at Careers and the Study of Political Science.