Poll: Rubio leads both Dems in Florida Senate race
© Haiyun Jiang

Sen. Marco RubioMarco Antonio RubioOvernight Defense: Joint Chiefs warn against sweeping reform to military justice system | Senate panel plans July briefing on war authorization repeal | National Guard may have 'training issues' if not reimbursed Senate panel plans July briefing on war authorization repeal Rising violent crime poses new challenge for White House MORE (R-Fla.) has a big edge over his potential opponents in November.

Rubio leads both Democratic candidates, according to a Quinnipiac University poll released Wednesday.

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Rubio initially said he would not run for reelection but has now decided to seek a second term.

Rubio has 47 percent support, to 40 percent for Rep. Patrick Murphy (D-Fla.) if the two face off in the Senate race.

In a match-up between Rubio and Rep. Alan GraysonAlan Mark GraysonFlorida Rep. Val Demings officially enters Senate race against Rubio Demings raises Democrats' hopes in uphill fight to defeat Rubio Demings planning to run for Senate instead of Florida governor MORE (D-Fla.), Rubio leads 48 to 40 percent.

The five declared GOP candidates for the seat all trail both Murphy and Grayson in head-to-head polls.

The Quinnipiac survey offered good news for Republicans in other Senate races.

In Pennsylvania, Sen. Pat Toomey (R-Pa.) has 49 percent support, with Democratic challenger Katie McGinty also at 49 percent.

And in Ohio, Sen. Rob PortmanRobert (Rob) Jones PortmanSenators say White House aides agreed to infrastructure 'framework' White House digs in as infrastructure talks stall White House advisers huddle with Senate moderates on infrastructure MORE (R-Ohio) is tied with former Democratic Gov. Ted Strickland at 42 percent each.

These three seats have been a source of concern for the GOP with presumptive presidential nominee Donald TrumpDonald TrumpIran claims U.S. to lift all oil sanctions but State Department says 'nothing is agreed' Ivanka Trump, Kushner distance themselves from Trump claims on election: CNN Overnight Defense: Joint Chiefs chairman clashes with GOP on critical race theory | House bill introduced to overhaul military justice system as sexual assault reform builds momentum MORE at the top of the ticket. Many Republicans believe Trump may imperil down-ballot Republicans with his divisive rhetoric and his lackluster fundraising efforts.

The poll surveyed 975 voters in Florida, with a margin of error of 3.1 percentage points; 971 voters in Ohio, with a margin of error of 3.1 percentage points; and 950 voters in Pennsylvania, with a margin of error of 3.3 percentage points.

— This article was updated at 10:17 a.m.