That campaign was the new politics against the old. Johnson was the new politics: electronic politics, technological politics, media politics. He didn’t pioneer most of the tactics (except for one tactic, which had astonishing side effects, the use of a helicopter as a campaign device), but he brought some of these still-new devices to a higher level of sophistication, using them to maximum effectiveness. Scientific polling, techniques of organization and of media manipulation – of the use of advertising firms, media experts from outside the party apparatus, of the use of electronic media (in 1948, radio) not only for speeches but for advertising to influence voters – the mature flowering of all these devices dates, in Texas and the Southwest, from Lyndon Johnson’s 1948 campaign.
via Robert Caro’s Means of Ascent: The Years of Lyndon Johnson, Volume 2