Why aren’t there more women leaders? Do women hold themselves back? Or is there something more intangible going on in the workplace? A new survey commissioned by the Center for American Progress, a liberal think tank, and Elle magazine pushes back against the notion that women are to blame, finding that more than half of the women interviewed say they speak up frequently in meetings, and “only 14 percent of mothers think their bosses give them less responsibility out of concern that they’re too busy with their families.”