On this August day, extreme heat and Republicans have invaded Milwaukee. It’s 96 degrees at noon, and feels 10 degrees warmer as the sun bakes the asphalt on Dr. Martin Luther King Jr. Drive. Downtown, TV people are sweating through their suits doing live shots outside the Milwaukee Bucks’ basketball arena, which will host the GOP’s kickoff presidential debate later tonight. It’s a rehearsal of sorts for next summer, when the GOP will return to the city for the Republican National Convention. Th