The early vote has given Democrats a lot of hope in Florida, where Hispanic turnout has shattered previous baselines. North Carolina’s early voting has been more mixed for Democrats.

We will know very quickly whether Mrs. Clinton is poised to deliver a knockout blow in either state.

The polls close in most of Florida at 7 p.m., and early vote results — which could represent 65 percent of the final vote — will come in fast. In 2012, half of the vote was counted by 8 p.m.

The early vote will be fairly representative of the eventual outcome: If Mrs. Clinton holds a comfortable lead, it will be hard for Mr. Trump to mount a comeback.

North Carolina polls close at 7:30 p.m., and the vote is counted quickly there as well.