In Florida, Republicans added a net 195,652 registered voters between this March’s presidential primary and the end of August, while Democrats added 98,362 and other voters increased 69,848. During the same period in 2016, Republicans added a net 182,983 registrants, Democrats 163,571 and others 71,982. In 2016, Trump prevailed in Florida by just 112,911 votes.
Even in heavily blue Miami-Dade County, where Hillary Clinton beat Trump by 29 points in 2016, Republicans added a net 22,986 additional voter registrations between March and the end of August, compared to 11,142 for Democrats.
In Pennsylvania, Republicans added a net 135,619 voters between this June’s primary and the final week of September, while Democrats added 57,985 and other voters increased 49,995. Between the April 2016 primary and the November 2016 general election, Republicans added 175,016 registrants, Democrats added 155,269 and others 118,989. That fall, Trump won the state by just 44,292 votes.
The pro-GOP trend since 2016 is also apparent, if less dramatic, in Arizona and North Carolina, two Sun Belt states Democrats have high hopes of flipping blue.