501(c)(3)s are prohibited from any type of political activity, unless it is to a slight incidental extent. Even then, the activity is closely regulated. If you want to be a political organization, you can register for a 501(c)(4) organization, which covers social and welfare groups.
An example of a political organization is www.moveon.org You may apply for tax exempt status under section 501(c)(4). However, donations are still not tax deductible for donors.
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