Is Rush Limbaugh the de facto Leader of the GOP?

Rahm Emmanuel has been setting Rush Limbaugh up as the bogeyman to position the President's agenda against because Limbaugh, they argue, is the head of the Republican Party. Some argue that it is a cheap political tactic. It is. But is it true? D.L. Hughley asked Michael Steele about it and Steele said that he was the head of the GOP...well, until like Representative Peter King who also denied the power of Limbaugh, he had to crawl back on his belly and kiss Limbaugh's feet. So, is Limbaugh really the head of the GOP?