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The latest census figures show 4.36 million Hispanics in Florida — representing 23 percent of the state’s population. Priorities USA is also teaming with the Service Employees International Union on a $4 million Spanish-language ad campaign in Florida, Colorado and Nevada to portray Mr. Romney as uncaring about average workers.

Mr. Romney’s campaign hasn’t aired TV ads in Florida, although four Republican groups — including the pro-Romney super PAC Restore Our Future — spent a total of $1.4 million in the Orlando TV market last month.