The coronavirus hasn’t changed this, Republicans here say. For Trump supporters, the one thing more frightening than a pandemic is the idea of weathering it in a socialist country, something many of them believe Democrats are pushing America toward.

Anxieties — the real and imagined, sincere and sinister — have long propelled Mr. Trump’s success. And now, as the Democratic Party veers further left on issues like health care and immigration, his ability to stoke them could be critical to piercing this blue stronghold of South Florida. If he succeeds, it would complete his coronation as the Florida Man of the modern Republican Party.

Since his election, the president has held 10 rallies across the state. That Mr. Trump included Florida in his so-called “Thank You” tour in December 2016 was fitting: His victory scrambled long-held wisdom about what it takes to carry this perennial battleground. Mrs. Clinton may have tallied more voters than any Democratic nominee since Jimmy Carter in cities like Jacksonville, where a strong showing has historically been central to Democratic victory. But Mr. Trump so toppled turnout models in rural and blue-collar counties that it didn’t matter.

Some 20,000 voters flocked to the Amway Center in Orlando for the president’s re-election campaign kickoff rally last summer, many of them for the same reasons. With Mr. Trump, they feel seen and emboldened after years of feeling belittled by the leadership in both parties.

And when it comes to the coronavirus crisis, they don’t feel that Mr. Trump’s early dismissive attitude toward the threat was dismissive at all; rather, it was his attempt to “stay positive” and not incite panic.

“I think that’s why President Trump has been really out front,” said Lee Green, a Republican in The Villages, a retirement community northwest of Orlando. “So that people will stay calm, and not be silly.” Few if any say they are concerned about Mr. Trump’s falsehoods or divisiveness.