The Republic of Croatia is not fully acquainted with the function of the European Parliament, or with its officials, because of which the interest was low. The major political parties and coalitions of the Republic of Croatia, by the inadequacy or complete non-existence of a marketing plan, showed their attitude towards the elections, but also towards their voters. Political advertisements were based on superficial messages; there was a lack of European topics. The advertising methods used in the European elections are advertisements in the press, billboards, television spots, online media, and social networks. Advertising on social networks is a new approach to advertising, where it tries to reach the target age group of voters who have so far been less likely to go to state and local elections. Although the number of voters has increased compared to previous years, their number is still far below average. Politicians in the Republic of Croatia are constantly the main actors in numerous scandals, which seemingly have no impact on their political careers. Newspapers reported in detail on the failure, affair, and scandal of each of our ministers and representatives, current as well as future. Likewise, the frivolity that manifested itself in the attitude towards scandals is also manifested in the way of advertising and planning of marketing tactics. Namely, based on my own experience, I was convinced that even large coalitions did not prepare detailed marketing plans in time to properly monitor the electorate. Political advertising is becoming less transparent. When advertising on social media, it is not possible to introduce monitoring of advertisements because you cannot clearly divide what would be and what would not be a political advertisement, especially when it is mostly done by algorithms and not by people. The impression of reduced transparency is certainly contributed by the inability of large coalitions to provide the required data on marketing campaign planning and disposition of funds. The impression of reduced transparency certainly contributes inability of large coalitions to provide the required data on marketing campaign planning and disposition of funds.