A flag blows at the Supreme Court in Washington, Oct. 2, 2025. America’s midterm elections will probably be determined primarily by issues like affordability. But what is at stake goes far beyond the quotidian concerns that many voters are focused on. (Aleksey Kondratyev/The New York Times) By NICHOLAS KRISTOF America’s midterm elections will probably be determined primarily by issues like affordability. But what is at stake goes far beyond the quotidian concerns that many voters are focused…