From NPR News in Washington, I'm Windsor Johnston. In the aftermath of Friday's deadly shooting at a suburban Connecticut elementary school that killed 20 children and seven adults, there is a renewed push to address gun control measures. White House spokesman, Jay Carney says, curbing gun violence will be no easy task. It's a complex problem that will require a complex solution. No single piece of legislation, no single action will fully address the problem. President Obama is promising to use the power of his office to tackle gun violence. The President is expected to engage the American people as well as lawmakers in the coming weeks. A Democratic senator, who was a gun rights advocate with an A rating from the National Rifle Association, is the latest lawmaker to indicate he may support a ban on assault weapons. NPR's Craig Windham reports Senator Joe Manchin of West Virginia says the mass killing of the young people in Newtown has changed the nation.