With no explanation, label each line with "O", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Senator
Barack
Obama
held
a
rally
for
his
2008
presidential
campaign
at
the
venue
on
June
5
,
2008
.
Senator:O
Barack:person-politician
Obama:person-politician
held:O
a:O
rally:O
for:O
his:O
2008:O
presidential:O
campaign:O
at:O
the:O
venue:O
on:O
June:O
5:O
,:O
2008:O
.:O