Democrats Nelson and Gillum lead key Florida Senate and gubernatorial races in final midterm stretch: NBC News/Marist poll

Democrats hold slim leads in Florida’s pivotal statewide races in the final push to Tuesday’s midterm elections, a poll released Monday found. In a Senate race that will help to determine control of the chamber, incumbent Democrat Bill Nelson leads Republican Gov. Rick Scott by 4 percentage points, according to the NBC News/Marist survey. The Democrat…