It never had any.
Or else Clinton would have been a one-term president.
Or else Clinton and Obama
would have been a one-term presidents.
Radio, even the talkshows, are entertainment and the hosts are entertainers*. Yutes listen to the so-called shock-jocks. The talkshows hosts are similar for an audience interested in political and newsie formats.
Example: Limbaugh did not sway his listeners to the Miers SC appointment, nor the Dubai ports deal. During that same era, Limbaugh was on the side of the open borders/amnesty pushers. He, not his listeners, changed positions. After GWBush lost both chambers of Congress in 2006, Limbaugh announced that he was 'no longer going to carry the water for the GOP.'
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* Entertainers until they become full infomercials for certain candidates or issues. Then, they are nothing but propagandists.