John Nichols says that, after the Wisconsin primary, Bernie has momentum on his side.

Also: David Cole argues that citizen activists are the real force behind changes in constitutional law—look at how the NRA changed the meaning of the Second Amendment; look at how the gay rights movement changed the meaning of “marriage.” His new book is Engines of Liberty.

Plus, Obama’s legacy: Gary Younge contrasts the symbolic victory with the real defeats for the left, especially in the use of US military power in the Mideast.

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