What's to blame for Rush Limbaugh's ratings 'tumble'?

The left is just plain giddy today. It cries victory. It believes Rush Limbaugh's ratings have tumbled since the Sandra Fluke controversy. 

Politico is among those with the news: 

The conservative radio host's ratings fell 27 percent in the key 25-54 demo in New York City, 31 percent in Houston-Galveston, 40 percent in Seattle-Tacoma, and 35 percent in Jacksonville, according to a selection of the March 29-April 25 Arbitron ratings provided by an industry source. 

Limbaugh's detractors attribute the losses to a rejection of the show following his controversial comments about the Georgetown law student.

But wait. This story sounds too familiar. Remember May 2011? Huffington Post was touting a similar Rush ratings crash back then:

Limbaugh still has the top-rated radio talk show in the country, but his audience has dropped by 33 percent since October. And he's not the only one--Sean Hannity's ratings have also slipped by 28 percent.

What's up with that? 

I suspect we're just seeing a seasonal audience shift. Radio listening habits shift with the seasons. For example, things like weather reports and storm warnings draw big audiences to News/Talk stations in cold winter months. When warmer weather arrives, audiences tend to get a bit of spring fever and often swap some of their News/Talk listening for peppy music programming, at least for a spell.

Libs trying to give one woman credit for a seasonal phenomenon shouldn't surprise anyone. It's sort of like their obsession with blaming people for global warming. So just chalk up Rush's spring numbers to climate change. The natural, cyclical kind that seems to bring the same result each year about this time.