ORLANDO, Fla. — Republicans have surpassed Democrats in early voting so far in Florida and have cut into their advantage using main-in ballots, an ominous sign for the party’s candidates in their uphill battle to unseat Republican Gov. Ron DeSantis and U.S. Sen. Marco Rubio on Nov. 8. “In Florida, the Democrats are in trouble,” said Michael McDonald, a professor of political science at the University of Florida. “Historically, Democrats lead in the early vote,” he said. “And right now, when you combine both the in-person and the mail ballots, registered Democrats are trailing the Republicans b…