Dennis Prager is one of the very best voices on talk radio today. He speaks with clarity on many of the most important issues of the day. I don't agree with all of his views, but he always makes me think when I listen to him. He is on the radio daily in most major markets or you can listen to him on the internet via his website. Also, be sure to check out his weekly column and other writings on his site.
Dennis is a practicing Jew. He teaches the Torah verse by verse. Check out his webpage for his teaching tapes.