Florida poll: 28 percent of GOP early voters picked Clinton
© Greg Nash

More than a quarter of Republicans who have already voted in Florida cast their ballots for Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonSanders expected to announce exploratory committee next week Bernie Sanders records announcement video ahead of possible 2020 bid Overnight Defense: Trump declares border emergency | .6B in military construction funds to be used for wall | Trump believes Obama would have started war with North Korea | Pentagon delivers aid for Venezuelan migrants MORE, according to a new poll. 

A TargetSmart/William & Mary poll released Tuesday showed 28 percent of early Florida voters picked Clinton over GOP 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. The poll, which will be released in full Wednesday, was shared early with MSNBC. 

The poll also showed Clinton ahead of Trump overall, 48 to 40 percent, with a larger lead, 55 to 37 percent, among those who said they already voted. 

In the Florida Senate race, the poll showed incumbent GOP 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 ahead of Rep. Patrick Murphy by 6 points, 49 to 43 percent. 

The poll surveyed 718 people, 311 who said they voted early, through web and phone interviews.