When he came here two decades ago, Doral was a warren of cargo warehouses. But as Venezuelans fled the economic depredations of a socialist president, Hugo Chávez, and his successor, Nicolás Maduro, Mr. Muñoz gained readers for his publications, which are known as El Venezolano. A restaurant serving arepas, Venezuela’s signature corn pancakes, became a social center of Doral.

Cubans, Colombians and Dominicans also moved in, building walled, palm-lined golf course communities. More than 200 companies based their headquarters in Doral. And Mr. Muñoz sold lots of ads.

In his columns, Mr. Muñoz rails against the leftist government that has reduced Venezuelans to hunger. But in regard to American politics, Mr. Muñoz, a naturalized citizen, is a registered independent who votes Democratic — yet another reason the vote in Florida may be so competitive.

Ten years ago, Republicans had a registration edge among the state’s Latinos — 37 percent were Republicans, 33 percent were Democrats and 28 percent independents, according to official figures. This year, the party lags among Latinos, with 26 percent registered as Republicans, 37 percent as Democrats and 35 percent as independents. And the independents increasingly lean Democratic, particularly among new immigrants and Puerto Ricans.