Political Organization Annual Reporting Requirements: Describing Exempt Purpose in Part III, Form 990

How should a political organization describe its exempt purpose in Part III of Form 990?

The exempt purpose of a political organization is to engage in political campaign activity. An organization may want to be more specific in describing its purpose. For example, a candidate committee may describe its purpose as "To elect X to Congress" while an environmental PAC may describe its purpose as "To elect candidates who support environmental issues."