Story highlights Hillary Clinton is stepping up attacks against primary opponent Bernie Sanders ahead of Nevada's caucuses

Part of Clinton's attack is painting the Vermont senator as a one-issue candidate

She previewed her message on the campaign trail Saturday during a Reno, Nevada, event

Henderson, Nevada (CNN) Hillary Clinton stepped up her efforts to cast Bernie Sanders as a single-issue candidate on Saturday in Nevada, firing up a largely union audience by arguing Sanders' economic message wouldn't fix a host of issues.

Clinton and her close aides, after losing in New Hampshire, plan to step up their attacks against Sanders ahead of Nevada's caucuses and South Carolina's primary, two critical contests where the former secretary of state needs victories to stem the Vermont senator's momentum.

"Not everything is about an economic theory, right?" Clinton rhetorically asked the crowd. "If we broke up the big banks tomorrow, and I will, if they deserve it, if they pose a systemic risk, I will. Will that end racism?"

This call-and-return continued, with Clinton growing more and more impassioned as the audience shouted "no" after every question.

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