Nationally syndicated radio host and bestselling author Mark Levin has wowed radio listeners with his vast knowledge of the Constitution for 12 years, beginning as a guest host for Sean Hannity. He brings his take-no-prisoners style and intellectual firepower to the Fox line-up on Sunday nights. Levin’s meteoric rise commands the respect of the conservative broadcasting world. Though his hosting debut on the network is recent, his addition to this list was a no-brainer.