Before attaining Fox “king maker” status and becoming the host of the highest-rated cable news show in the U.S., Tucker Carlson had previous TV incarnations. He used to be on the other side of the spectrum with CNN (2000-05)and MSNBC (2005-08).He was also a contestant on ABC’s “Dancing with the Stars.” It’s yet another reminder that cable punditry and commentary is show business. It’s about conflict, partisanship, bumper-sticker sound bites and appealing to a loyal base that produces sponsor-impressing ratings via 4 million viewers.