JAMES TARANTO: Another attack on Romney predictably backfires. “The truth is that Romney and Obama are both products of distinctively American subcultures–respectively, the Mormon church and the academic left. The difference is that whereas the Mormons, for more than a century, have aspired to join the American mainstream, the academic left is aggressively adversarial. It’s true that there is much about Mormonism that seems odd to people of other faiths. But a contest over whose opponent is weirder is one Obama cannot possibly win.”