With no explanation, label each line with "O", "organization-politicalparty", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Castor
was
a
member
of
the
Republican
Party
until
2015
,
when
she
became
a
member
of
the
Democratic
Party
.
Castor:person-politician
was:O
a:O
member:O
of:O
the:O
Republican:organization-politicalparty
Party:organization-politicalparty
until:O
2015:O
,:O
when:O
she:O
became:O
a:O
member:O
of:O
the:O
Democratic:organization-politicalparty
Party:organization-politicalparty
.:O