If you want to pretend that you’re in Milwaukee, throw some brats on the grill and grab a six-pack of Miller High Life — there are much worse ways to spend a Thursday night. But there will hopefully be a moment in this coming week’s glorified Zoom meeting that we’re pretending is the Democratic National Convention — probably when more Americans are watching Stanley Cup hockey than the comic stylings of ex-Ohio Gov. John Kasich — when it will dawn on America’s elite pols and pundits what should have been clear decades ago.The American political convention is dead.As a 61-year-old political jour…