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Mr. Romney isn’t the only one banking on winning Hispanic voters in the primary. Rep. Ron Paul’s campaign argues he can win among the growing population, and aims to prove that in Nevada, which holds its caucuses on Saturday.

But Mr. Paul will have to improve dramatically on his Florida showing. He won just 5 percent of Hispanic voters’ support, according to the exit polls — behind Mr. Romney, Mr. Gingrich and even former Sen. Rick Santorum.