It hasn’t aired yet, but I want to share with you the political ad that could win the 2022 midterm elections for the Democrats — even with all the doom and gloom about President Joe Biden’s approval rating and all the historical trends that favor the GOP. For reasons that will be clear in a minute, I’m not using the candidate’s name. The TV spot starts with one of the most dramatic and best-known sound bites in American history: the Rev. Dr. Martin Luther King Jr. at the Lincoln Memorial in 1963, proclaiming, “I have a dream that my four little children will one day live in a nation where they…