I once again want to reiterate, nationally RFK is polling at 3.8%. In Florida, however, RFK has been polling at closer to 6%.
In 2020, 77% of Florida's 14,565,738 registered voters turned out, roughly 11,215,619 people.
In that election, Gary Johnson (who had previously pulled 2.2% of the vote away from Trump, resulting in a 49% win) was not the Libertarian nom, and Jorgensen only pulled 0.64% of the vote, giving Trump a +3% win.
RFK voters pull voters away from Trump more than from Harris.