TEXT: A group of boys walk past a partially collapsed row house in Baltimore. The nation's poverty rate stood still at 15 percent in 2012, the sixth straight year that it has failed to improve. Even as the economy shows signs of improvement and poverty levels off, new U.S. census data suggests the gains are halting and uneven. Depending on education, race, income and even marriage, not all segments of the population are seeing an economic turnaround.