The Democrats' wage problem

Democrats were gleeful this week when Donald Trump blurted out in Tuesday's debate that “wages [are] too high.” But as Hillary Clinton, Bernie Sanders and Martin O'Malley prepare to debate Saturday night, the Democrats have a wage problem of their own: American incomes have dropped during the Obama presidency.
It's a vulnerability that Republicans haven't figured out how to exploit, and it's clearly one of the biggest weaknesses in the Obama economic recovery.
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In 2014, the last year for which Census data are available,...