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The Mellman Group’s poll last month — done on behalf of For Maryland Jobs and Schools, a pro-gambling-expansion group — showed support at 61 percent and opposition at 27 percent.

However, an OpinionWorks poll commissioned last week by the Baltimore Sun showed the difference between supporters and opponents of the law was within the 3.5 percent margin of error, with 44 percent of voters supporting the law and 41 percent opposing it.

“Rather than making an emotional decision, a factual decision needs to be made on the issue,” said Delegate Neil C. Parrott, Washington Republican and chairman of MDPetitions.com. “I’m very positive that we’re going to win it.”

The Dream Act has gained support from not only leading Democrats, but also from the University System of Maryland, which argues that the law — in combination with President Obama’s executive action this year allowing young illegal immigrants to get work permits without risking deportation — will help to produce a better educated, more capable workforce in the state.

Opponents “try to make it an immigration issue, and it isn’t,” Mr. Ramirez said. “This is an investment, and it’s a decision that we have to make.”

If voters approve the law, it would make Maryland the 12th state to approve in-state tuition rates for some illegal immigrants.