Synonyms to whistle-stopper

candidate, addict, agent, also-ran, applicant, appointee, aspirant, aspirer, assignee, baby kisser, bidder, campaigner, claimant, collector, coveter, dark horse, defeated candidate, deputy, desirer, devotee, dud, entrant, fancier, favorite son, freak, hankerer, has-been, hopeful, lame duck, licensee, lover, nominee, office seeker, petitioner, political hopeful, possibility, postulant, presidential timber, prospect, runner, running mate, seeker, selectee, solicitant, solicitor, stalking-horse, stumper, suitor, suppliant, supplicant, votary, wanter, wisher, yearner, Chinese puzzle, baffling problem, brain twister, crossword puzzle, crux, electioneer, enigma, enigmatic question, floorer, jigsaw puzzle, knot, knotty point, mind-boggler, mystery, nut to crack, perplexed question, perplexity, poser, problem, puzzle, puzzlement, puzzler, question, question mark, sixty-four dollar question, sticker, stump orator, stump speaker, tough proposition, vexed question, why