March 15th, 2012
01:48 PM ET
(CNN) - Vice President Joe Biden on Thursday harshly attacked the economic policies of Republican presidential contenders Mitt Romney, Newt Gingrich and Rick Santorum, calling them a threat to the American middle class.
"If you give any one of these guys the keys to the White House, they will bankrupt the middle class once again," Biden told autoworkers in Ohio, a key battleground state for Obama's re-election bid in November.
The speech by Biden at a United Auto Workers hall in Toledo was the first of four planned in coming weeks as Obama's top campaign surrogate, and he went after the Republican candidates by name - something the president has not done.
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