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Hillary Clinton proposed a 30 percent tax on the wealthiest Americans while speaking at a rally along with billionaire investor Warren Buffett in Omaha, Neb., on Wednesday.

The tax, known as "the Buffett rule," requires those making over $1 million per year to pay the increased tax. Buffett, who has argued millionaires shouldn't make more than their secretaries, endorsed Clinton at the event.

"Right now there has been too much that allows to let the wealthy get wealthier at the expense of other people," Clinton said.

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