Fighting Back the Right: Reclaiming America from the Attack on Reason
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The biggest friend the left has is rational discourse. Whenever we enter the politics of name calling or silliness we are distracting from the facts surrounding the real issues and we are hurting ourselves.
The other warning that the author dwells on (and I agree with) is the fact that "corporations are not people too" and should not be given constitutional rights as if they are people. Most of the issues on the left can be argued in terms of corporations should not be given special rights (social security doesn't need to be privatize in order to make corporations rich, and so on).
All in all a pleasant little book to read and even reads like a long easy to read blog post.