Synonyms for Endorsement (same or very similar meaning)
WordNet sense 1 (a promotional statement (as found on the dust jackets of books)):
blurb, indorsementWordNet sense 2 (formal and explicit approval):
countenance, imprimatur, sanction, warrantWordNet sense 3 (a speech seconding a motion):
second, secondmentFrom the ODE community, based on WordNetadd/edit