WASHINGTON — Dallas Mayor Eric Johnson, the chairman of the Republican Mayors Association, said the GOP losing the Miami mayorship for the first time in nearly 30 years should serve as a “wake-up call” to all Republicans — beyond the Latino-majority Florida city.

“The Democrats got very involved in the Miami mayor’s race very early and put a ton of money into it, particularly once the primary was determined. I think we got outspent 19 to 1,” Johnson told The Post in an exclusive interview Wednesday.

“Republican candidates run differently in this environment when Trump’s on the ballot versus when he’s not. And we’ve got to figure that out as Republicans,” he added, noting that it will be a key problem to solve for congressional candidates in the 2026 midterms too.

The city’s population i

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