I’m not sure if, even if judged during the Jurrassic Age when Brontasaurus  Apatosaurus roamed the earth, Rush Limbaugh wouldn’t be the biggest asshole on the planet.
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U.S. News – Limbaugh: Contraception advocate should post online sex videos
http://usnews.msnbc.msn.com/_news/2012/03/01/10552338-limbaugh-contraception-advocate-should-post-online-sex-videos 

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edit: (thanks Daniel) :

Apatosaurus (/əˌpætɵˈsɔrəs/), also known by the popular but scientifically redundant synonymBrontosaurus, is a genus of sauropoddinosaur that lived from about 154 to 150 million years ago, during the JurassicPeriod (Kimmeridgian and early Tithonian ages).^[1] It was one of the largest land animals that ever existed, with an average length of 23 m (75 ft) and a mass of at least 23 metric tons (25 short tons)

I was being scientifically rudundant.  Oh..and I was trying to type “period” on my phone but “age” came out cleaner on the third try.

Now…it does look like being 75 feet long..vs a 6 foot man…and if you’ve ever seen the “goatse” picture (please: DO NOT GOOGLE THIS)…mulitply that picture (standing in for the largest asshole other than Rush Limbaugh)…and we guess Apatosaurus had a 10 foot wide (possibly) asshole.  So…to not be scientifically inaccurate, which I strive to (not) be…Rush Limbaugh is a huuuge asshole.

But there may, just may, have, at some time, been a bigger asshole on the planet.

Technically.