THESAURUS
endorser
Maecenas, abettor, admirer, advocate, aficionado, angel, apologist, approver, backer, buff, certifier, champion, confirmer, cosignatory, cosigner, defender, dependence, encourager, exponent, fan, favorer, friend at court, guarantor, insurer, lover, mainstay, maintainer, notary, notary public, paranymph, partisan, party, patron, promoter, protagonist, ratifier, reliance, second, seconder, sectary, sider, signatory, sponsor, stalwart, standby, subscriber, support, supporter, sustainer, sympathizer, underwriter, upholder, votary, well-wisher