Tim Fernholz asks if progressive excitement is the key to Democratic victory in the fall:

Democratic leadership needs the support of stalwart left voters this fall, and they know it: Voter enthusiasm among Democrats is low, half that of Republicans, according to Gallup surveys. Republican voter excitement outweighed that among Democrats in 1994, helping sweep in a GOP majority. Strategists for the current incumbents fear that the same thing might be happening now. Even worse, some fear that progressive activists are fueling the fire.

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