Associated Press: The White House-forged auto emissions deal among long-warring states, carmakers and environmentalists is the most dramatic evidence yet of what President Obama is hoping to brand – and eventually sell to voters – as his signature governing style. “In the past, an agreement such as this would have been considered impossible,” Obama said Tuesday in announcing the deal, the usually poker-faced president reveling in his own achievement. “It represents not only a change in policy in …