As PopSci astutely acknowledged in this 1924 article, "Politics is largely a matter of publicity." Today we all glue ourselves to the set to listen to Mittens and Barry argue over binders full of women, but back in the day, getting a candidate's message to a large audience was a little more difficult. But with the advent of radio, campaigners found themselves for the first time able to reach large swaths of the population in one fell swoop. In the 1920 election, 25,000,000 people voted, making the 10,000,000 estimated radio listeners in the country a hugely appealing demographic. "Indeed, through the magic of radio, either of this year's candidates [Calvin Coolidge and John W. Davis], if his line is connected with such a chain of broadcasting stations, can talk through his own home or office telephone to an audience greater possibly that the total number of people who heard the voices of every presidential candidate since the time of Lincoln!" And as anyone who's heard of "War of the Worlds" can tell you, people tend to believe what they hear on the radio.