(Speaking of specifics: As Sen. Warren said this week, this would be a good time for Hillary Clinton to "weigh in on trade.")
These voters want answers, and they want change. Since they're not seeing that, they have concluded that politics is pointless. So they either hunker down in predetermined party preferences or choose not to vote at all.
The activist left isn't important because of its numbers. It's important because its members are the canaries in the coal mine for an unresponsive political process. A Democratic Party that patronizes them will also fail to reach the disaffected majority.
The left shares something else with that majority: it's heard a lot of empty promises. Many (though not all) progressives will vote for the Democrats once again in 2016, even if they're dissatisfied. But it will take more than rhetoric to win millions of other alienated voters. It will take commitment -- and action.
Want to know how to do that? Once again, the left can point the way.
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