With no explanation, label each line with "person-politician", "O", "other-law", "organization-government/governmentagency", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
While
in
the
Senate
,
he
and
Reverdy
Johnson
were
the
only
Democrats
in
that
chamber
to
vote
for
the
Thirteenth
Amendment
to
the
United
States
Constitution
to
abolish
slavery
.
While:O
in:O
the:O
Senate:organization-government/governmentagency
,:O
he:O
and:O
Reverdy:person-politician
Johnson:person-politician
were:O
the:O
only:O
Democrats:O
in:O
that:O
chamber:O
to:O
vote:O
for:O
the:O
Thirteenth:other-law
Amendment:other-law
to:other-law
the:other-law
United:other-law
States:other-law
Constitution:other-law
to:O
abolish:O
slavery:O
.:O