Democratic presidential candidate Martin O’Malley suggested Sunday that Congress had fallen under the sway of "white racism" and the political force of the National Rifle Assn. in refusing to respond with new laws to a cascade of shooting incidents in recent years.. Speaking before the nation’s mayors, gathered in San Francisco, O’Malley pointed to gun restrictions passed when he was governor of Maryland to ban assault weapons, enforce background checks and tighten permitting procedures -- efforts that have been blocked at the national level by Republicans, and some Democrats, in Congress. "One of the sad triumphs of white racism is...