Poll: 4 in 10 Latino Americans have no opinion of Rubio

But while Rubio remains an unknown quantity among many Latinos, those who do know him tend to like him. Of those surveyed, 23 percent said they had a favorable opinion of the Florida lawmaker, while 12 percent saw him negatively.

By contrast, 65 percent of Latinos view favorably another rumored 2016 candidate: former Secretary of State Hillary ClintonHillary Rodham ClintonTrump postpones Hispanic roundtable California governor: Clinton should be worried Labor leader: Clinton told me NAFTA should be renegotiated MORE. That's a percentage point better than President Obama's showing in the survey.

Democrats also continue to hold a generic advantage when Latino voters are asked who best deals with the country's immigration system. While 37 percent say Democrats do the better job, only 11 percent say Republicans do.

The poll found that Latino support for a pathway to citizenship far outpaced even the majority support — 64 percent — among all Americans. And while 65 percent of Latino Americans say that immigration strengthens the country, only 54 percent of the entire country shares that sentiment. 

Latinos are also more likely to say that immigration strengthens the United States, with 65 percent of Latinos and 54 percent of all Americans sharing that opinion. Conversely, while 63 percent of all Americans say the nation's southern border is not secure, only 49 percent of Latinos agree.

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