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 ":".
He
previously
served
as
a
Legislative
Fellow
for
Sen.
Jay
Rockefeller
(
D-WV
)
and
a
senior
health
policy
advisor
to
the
2008
presidential
campaign
of
Sen.
John
McCain
(
R-AZ
)
.
He:O
previously:O
served:O
as:O
a:O
Legislative:O
Fellow:O
for:O
Sen.:person-politician
Jay:person-politician
Rockefeller:person-politician
(:O
D-WV:O
):O
and:O
a:O
senior:O
health:O
policy:O
advisor:O
to:O
the:O
2008:O
presidential:O
campaign:O
of:O
Sen.:person-politician
John:person-politician
McCain:person-politician
(:O
R-AZ:O
):O
.:O