By Jeffrey Sparshott      Homeland Security Security Janet
Napolitano had a relatively uneventful appearance Sunday on CNN,
and that counts as a victory of sorts.      A year ago,
following a Christmas Day attempt to blow up an airliner, Ms.
Napolitano caused a furor by saying on CNN that the “system
worked.” She quickly clarified her remarks, saying they had been
taken out context. She said she meant to convey that the system
worked well after Nigerian Umar Farouk Abdulmutallab failed to
set off explosives stitched to his underwear–not before, when
Mr. Abdulmutallab was permitted to board the airliner despite
warning signs.      Some called for Ms. Napolitano’s head, but
she kept her post. On Sunday, she told CNN that systems to
protect the country from a terrorist attack are improving.
“I guess the overall message is, everything is objectively
better than it was a year ago, particularly the aviation
environment,” she said.      In the wake of the Abdulmutallab
case, the government has installed full-bo