Adjective
on message (comparative more on message, superlative most on message)
(colloquial, politics) Alternative spelling of on-message
on-message (comparative more on-message, superlative most on-message)
(politics) Publicly reiterating and supporting the official party policy; conforming to the party’s agreed policies.
on-message
I think Democrats are always challenged to have a unified message, and it's in part because our strength is our diversity as a party, but our weakness is also the fact that because we're so diverse, we have a hard time getting on one page on message. Martin Heinrich