base. hours later, a car bomb exploded in kabul, killing at least six people. then more explosions and gunfire for hours. the taliban said it was response to the president s visit. back home, mitt romney again backed off earlier criticism of mr. obama s decision to go after osama bin laden. had i been president of the united states i would have made the same decision the president made, which was to remove him. reporter: the president is out of afghanistan, heading home, expected back here in washington this afternoon. thanks. tonight don t miss an hour-long special edition of rock center, inside the situation room with president obama and his national security advisers. it airs at 9:00/8:00 central on your local nbc station. as tracii just mentioned, mitt romney appeared at a new york city firehouse. actor alec baldwin told lawrence o donnell his view on how the