With no explanation, label each line with "O", "event-election", "person-politician", "building-restaurant", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other" or "art-painting" preceded by ":".
During
the
summer
of
the
2008
U.S.
Presidential
election
campaign
,
Crosson
's
30-second
video
won
Denny
's
Restaurant
's
nationwide
contest
for
the
best
impressionist
of
the
then-candidate
Barack
Obama
.
During:O
the:O
summer:O
of:O
the:O
2008:event-election
U.S.:event-election
Presidential:event-election
election:event-election
campaign:event-election
,:O
Crosson:person-other
's:O
30-second:O
video:O
won:O
Denny:building-restaurant
's:building-restaurant
Restaurant:building-restaurant
's:O
nationwide:O
contest:O
for:O
the:O
best:O
impressionist:O
of:O
the:O
then-candidate:O
Barack:person-politician
Obama:person-politician
.:O