The phrase 'most populist' indicates a widespread appeal and popularity. Synonyms for 'most populist' include 'most popular', 'most favored', 'most liked', 'most accepted', 'most celebrated', 'most acclaimed', 'most idolized', 'most beloved', and 'most adored'. These synonyms all suggest a high level of admiration and affection from a wide range of people towards an individual, group or concept. One should note that while 'populist' may have a positive connotation, it can also imply a pandering or exploiting strategy for political gain, so it's important to use the correct context when choosing synonyms.