In a statement Tuesday, Torres wished Booker good luck and said she's enjoyed her six years' working for him.
Booker was considered one of President Barack Obama's biggest supporters. In his May 20 TV appearance he described as "nauseating" attack ads against Bain Capital, the private equity firm once run by Republican presidential candidate Mitt Romney.
Booker subsequently backed off the remarks in a YouTube video, saying he was just expressing frustration with negative campaigning.
Torres' resignation was first reported by politickernj.com
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