JAMES OLIPHANT THE Democratic National Convention has showcased the party's elder statesmen, up-and-coming political stars and delegates from colourful locations across the country all pressing to make Joe Biden the next U.S. president. Here are five takeaways from the second night of the convention: A TENTATIVE TRUCE The Democratic Party's moderates and progressives have declared a truce to establish a unified front against President Donald Trump. But it may last only as long as Biden's presidential campaign, win or lose. That was made apparent in a short address by Representative Alexandria Ocasio-Cortez, a progressive force within the party. In a…