Mr. “It’s the economy, stupid” James Carville is scheming how to exploit the economy for hapless Democrats to use as a political cudgel against President Donald Trump. Carville’s latest guest essay for The New York Times, “How to Turn Trump’s Economic Chaos Against Him,” scrambled to find some silver lining to Congressional Democrats’ political woes, given that they’re currently “underwater” with their own voter base according to Politico March 31. In Carville’s 20th century worldview, Trump violated the “cardinal rule” of American politics by supposedly “destabiliz[ing] the economy” with his tariffs, despite the fact that this was one of his...