Radio as a political weapon

While I was listening to the radio this morning I was thinking, what was the impact from the radio for politicians?

Going back to the time that there was no such thing as television, radio was for most of the people the primair source off information. 

Radio was a great tool for propaganda. Politicians therefore used the radio to persuade their voters. They used the tool to reach out to all the people. 

I was wondering the most about the impact of the radio today and back in the days. Is there a shift? Is the impact of the radio still the same as it was 50 years ago?

In my opinion, there is definitly a shift. Nowadays the impact of the radio is not that big anymore as it was in the earlier days. Radio does not give the face-to-face impression like television, the voice is the most powerfull thing here. No use of non-verbal communication.

Politicians speak directly, without a intermediary, like we have with the newspapers e.g. the editor. The voice of the politicians will or can not be changed. Although the communication is direct, I think the newspapers, in comparison with the radio, still have a greater impact on people. 

It can be that I am wrong and that some people still think that the radio is having a great impact on people. if you think differently than me, don't hesitate to comment.