In order to let voters know the candidates better, candidates will do a lot of peripheral propaganda activities during the election campaign to canvass their votes, especially in foreign elections. Supporters of candidates also support their candidates in various ways.
For example, if you wear an election t shirt with a candidate's head on it to express your support, it will become a propaganda tool for politicians. The first one to print the slogan on the T-shirt was during the presidential campaign. Wearing the slogan on the T-shirt was more influential than holding the sign and shouting slogans by supporters.