In 1994, Sen. Dianne Feinstein used the tragedy of San Francisco's 101 California massacre to push a decadelong ban on assault weapons through Congress. But even the horror of Saturday's slayings of four Oakland police officers is unlikely to break through the bipartisan opposition that blocked the renewal of that ban in 2004. House Speaker Nancy Pelosi, D-San Francisco, Senate Majority Leader Harry Reid, D-Nev., and dozens of House Democrats have said they oppose... (GunPolicy.org)