Democratic presidential candidates backed significantly higher taxes on wealthy individuals and corporations in their debate Saturday night.

Challenged to describe how they would raise revenues for their spending agendas, the Democrats, who have so far shied away from detailed revenue plans, endorsed popular tax hikes.

Hillary Clinton, the front-runner, promised no new taxes on middle-class families, while her two challengers endorsed higher tax rates on top individual taxes and on investments.

"Hard-working middle class families need a raise, not a tax increase," the former secretary of state said.

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