Will Florida’s Latino voters pick the next president?

Latino voters, who lean Democratic overall, could be a decisive force in key battleground states this cycle. Florida’s Latino community includes right-leaning Cubans and dozens of other subgroups – none politically monolithic.

The colorful party bus winds its way through residential Miami, Colombian and American flags flying, salsa and Latin pop blaring. A caravan of cars follows, “Vota Biden” scrawled on each in large white letters.

A woman driving a minivan flashes a thumbs-up. Most passersby ignore the parade. But to Serena Perez-Ellis, the public show of enthusiasm for former...