Another poll shows Democratic Sen. Bill Nelson and Gov. Rick Scott tied in a hypothetical 2018 matchup.
And Scott has gained on Nelson since Mason-Dixon polled the race in February.
Nelson and Scott each took 44 percent of the vote, with 12 percent of people undecided.
Nelson remains ahead among Democrats (82%-9%), women (47%-40%), blacks (87%-4%) and Hispanics (54%-32%). Scott still has the advantage with Republicans (81%-6%), men (49%-40%) and whites (54%-34%).
The swing has come primarily among unaffiliated voters, with Scott taking a 44%-40% lead. In February, Nelson was ahead of Scott 46%-37% among these independents, according to a polling memo.