Story highlights Clinton reiterates attack against Sanders on auto bailout

Both rivals pledge not to deport undocumented immigrants who aren't accused of a crime

(CNN) Hillary Clinton and Bernie Sanders waged an acrimonious debate duel Wednesday, throwing punches on immigration reform, auto bailouts and health care as they drew up fresh battle lines ahead of crucial primaries next week that could dictate how long their quest for the Democratic nomination will last.

Clinton returned to her attack on Sanders for opposing the auto bailout. She noted that in December 2008, she and Sanders voted to support rescue for Detroit that was blocked by Republicans. But before President Barack Obama took office in 2009, the bailout was folded into a bailout bill for financial firms.

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"Sen. Sanders voted against it," Clinton said at the Univision debate in Miami. "That is his perfect right to vote against it, but if everyone had voted as he voted, we would not have rescued the auto industry."

It was a noteworthy position for Clinton since she took a similar stance in the run-up to the Michigan primary, betting that it would resonate in the heart of the auto industry. But it didn't -- she lost Michigan to Sanders in a surprise result and exit polls there indicated Democratic voters trusted the Vermont senator more on issues related to the economy and trade. And it's not clear that the strategy will play any better in the Midwestern states going to the polls next week, including Ohio and Illinois.