Answer:
Through propaganda and advertisement
Step-by-step explanation:
PROPAGANDA is a way at which politicians and interest group influence people's attitudes and belief through the spreading of information or rumor for the purpose of helping or or causing harm to individual(s)/candidate(s) or an institution.
Politicians and interest group make use of uses all the kinds media available to spread their message. The media they use include; the press, radio, television, posters, door-to-door canvassing, handbills, speeches, social media/internet, books, music, fax machines and so on.
Propaganda is so powerful because everyone is susceptible to it. Politicians use propaganda to elevate themselves above their oposition(s).