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

Sen. Marco RubioMarco Antonio RubioOn The Money: Trump declares emergency at border | Braces for legal fight | Move divides GOP | Trump signs border deal to avoid shutdown | Winners, losers from spending fight | US, China trade talks to resume next week Trump declares national emergency at border Democrats veer left as Trump cements hold on Republicans 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's Darren Soto fends off Dem challenge from Alan Grayson Live results: Arizona and Florida hold primaries The Hill's Morning Report: Frustration mounts as Republicans blow up tax message 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 PortmanSteel lobby's PR blitz can't paper over damaging effects of tariffs Trade official warns senators of obstacles to quick China deal Lawmakers divided over how to end shutdowns for good 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 John TrumpGillibrand backs federal classification of third gender: report Former Carter pollster, Bannon ally Patrick Caddell dies at 68 Heather Nauert withdraws her name from consideration for UN Ambassador job 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.