Republicans are scoffing at Democrats’ attempts to explain why President Barack Obama’s failed green-tech investments are unimportant but Mitt Romney’s few failures at Bain Capital, an otherwise wildly successful private equity firm, are a scandal. Obama deputy campaign manager Stephanie Cutter tried out the new tactic during a May 30 appearance on MSNBC’s “Daily Rundown,” when she was asked about the president’s support for Solyndra. “The president’s not picking winners and losers, he’s making strategic investment to promote clean energy,” she said. “Mitt Romney’s role at Bain Capital was to make profits for his investors and for himself. … There...