The old saw that victory has a thousand fathers took on a new twist Tuesday as House Speaker Nancy Pelosi, D-Calif., announced that she supports an affirmative vote on the best trade deal ever negotiated by an American president – the U.S.-Mexico-Canada Agreement (USMCA). Remember that Pelosi, along with more than 100 other Democrats, voted for the North American Free Trade Agreement (NAFTA) in 1993. In sharp contrast, there should be no mistake about this: Donald Trump was a NAFTA critic from the get-go. The USMCA is President Trump’s vision, and it is a poster child of yet another promise...