President Barack Obama is launching an administration-wide effort to curb gun violence, underscoring the growing political consensus over tightening gun restrictions following the horrific massacre at a Connecticut elementary school, the Associated Press reports. Obama is tasking Vice President Joe Biden, a longtime gun control advocate, with spearheading the effort. In remarks from the White House on Wednesday, Obama will outline a process for pursuing policy changes following the school shooting, though he is not expected to call for specific measures…