To understand this week's election, look to economic and political lessons from Argentina.To understand why Democrats overperformed in this week's elections, look to Argentina. Last month, Argentinian president Javier Milei won an unexpectedly large electoral affirmation, as his party significantly outperformed expectations by more than doubling its congressional representation in what was widely seen as a referendum on his agenda. Over the past two years, Milei, the world's most libertarian national leader, has slashed spending, cut red tape, and made his top priority restoring economic order and prosperity to a country that has long been a socialist basket case. Critics...