In two separate cases, federal judges dismissed claims against Countrywide and Fannie Mae for misleading investors about their risky subprime loans – a substantial victory in the midst of an avalanche of lawsuits, millions in settlement dollars and no real end in sight. Former Fannie shareholders recently brought a case on behalf of themselves and a class of others that purchased or acquired Fannie common stock and/or options between Nov. 8, 2006, and Sept. 5,…