Story highlights Clinton hits Sanders for voting to loosen a Wall Street regulation in 2000

She didn't mention the legislation was signed into law by former President Bill Clinton

(CNN) Hillary Clinton on Sunday night sought to plant seeds of doubt in voters' minds over Bernie Sanders' repeated pledges to crack down on Wall Street.

To do it, Clinton had to go back more than 15 years, and shine a light on a decision that her husband, by his own admission, would come to regret.

"You're the only one on this stage that voted to deregulate the financial market in 2000," Clinton said, making reference to his support for former President Bill Clinton's Commodity Futures Modernization Act.

The law effectively gave bankers, or "sophisticated traders," free rein from pre-existing oversight mechanisms when they wanted to make deals on the sidelines of the major stock exchanges, in "over-the-counter" trading.

Clinton himself would later cop to having made a serious mistake in signing the bill, saying he didn't understand the extent to which these deals, if they went bad, could ripple across the global economy.

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