"The race is essentially unchanged from last fall, with Republicans still introducing themselves to voters and Bill NelsonClarence (Bill) William NelsonOvernight Tech: Senate panel subpoenaed ex-Yahoo chief | Twitter gives all users 280 characters | FBI can't access Texas shooter's phone | EU wants tax answers from Apple Overnight Cybersecurity: What we learned from Carter Page's House Intel testimony | House to mark up foreign intel reform law | FBI can't access Texas shooter's phone | Sessions to testify at hearing amid Russia scrutiny Former Yahoo CEO subpoenaed to appear before Congress MORE leading the field comfortably," PPP President Dean Debnam wrote in a polling memo.

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Nelson's approval ratings are far from where the candidate would like to be in an election year. Thirty-six percent of Florida voters said they approve of Nelson, while 32 percent disapprove. Even among Democrats, only 55 percent approve of the senator.

One in three voters doesn't report having an opinion — a surprisingly high figure for an incumbent senator that is exaggerated further when gender is taken into account. Of the women polled, 43 percent said they didn't have an opinion of Nelson, compared to just 20 percent of men.

The poll of 700 Florida voters was conducted April 12-15 using automated telephone interviews, and had a margin of error of 3.7 percentage points.

The Hill rates this race as leaning Democratic.