Why, asks a Democrat leading a training session for fellow activists, doesn't "Yes we can" work as a slogan any more? "Because we haven't," a jaded participant responds. Progressives, as bedrock Democrats like to call themselves, are despondent. The election euphoria of 2008, when their party secured heavy maj orities in both chambers of Congress and Barack Obama won the presidency with ease, has deflated so rapidly that analysts are now diagnosing on the left an affliction they ascribed to the Republicans back then: an "enthusiasm gap".
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