WI: No Television

How could television never be invented, or at least not invented until much later? Is this even possible, or was the advent of television only inevitable after radio and movies? I think that, had television never been invented, there would be a significant effect on politics. In 1960, a majority of people who watched the Nixon-Kennedy debates on television said that they thought Kennedy was the winner, while those who listened to it on the radio thought otherwise. Since then, image has always been a factor in electoral politics.
 
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