Yes and no - Carney's statement simply reflects political reality. A new AWB won't make it through the current Congress and Obama doesn't want to back something he knows won't get passed. All he would achieve by calling for a new AWB would be to further energize the "bitter clinger" crowd and raise money for the NRA.
He (and Romney) are going out of their way to NOT politicize this tragedy. Notice how both campaigns have taken their ads off the air? Obama is going to leave the politicization to others. He'll just sign the new AWB if it happens to land on his desk. That would be in line with his previously stated policy goals and stance on 2A issues.

