(CNN) - In a new survey of potential 2016 presidential candidates, 52% of registered voters say they have a favorable opinion of former Secretary of State Hillary Clinton, down from 61% who said the same thing in February.

But the Quinnipiac University poll shows Clinton would be the favorite in hypothetical matchups against Republican Sen. Rand Paul of Kentucky and former Florida Gov. Jeb Bush.

Clinton finished out her term in early February with high marks in public polls. But as she has largely stepped out of the limelight and as Republicans have ramped up efforts to pin the Obama administration over the Benghazi attack, the new survey released Friday indicates her favorable rating has dropped.

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