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After the meeting, she turned to Twitter and wrote: “I misspoke, Romney’s position on immigration is clear.”

Hispanics have emerged as a key bloc in presidential elections. George W. Bush walked away with 40 percent or more of the Hispanic vote in his successful 2000 and 2004 presidential elections. In 2008, Hispanics went heavily for Mr. Obama, who secured 67 percent of their vote, compared with 31 percent for Sen. John McCain of Arizona.

In a nationwide Fox News poll in March, 70 percent of Hispanics said they would vote for Mr. Obama and 14 percent for Mr. Romney in a head-to-head matchup. Meanwhile, nine out of 10 Hispanic U.S. citizens said they support the Dream Act, while eight in 10 said they support a path to citizenship for illegal immigrants.