Move over MTV: The U Network (search) is coming to college campuses this fall, boasting what it calls a more intelligent, "clean" alternative for today’s young people. "They’ve dumbed [programming] down — I don’t know why,” said TUN creator Shane Walker, 38, referring to MTV (search). “But we’re going to change it." TUN aims to challenge what it says is MTV's liberal bias as well as compete with the entertainment channel by including student-based programming and in-house productions co-produced by students like "The W Show," a docu-series based on President Bush’s 2004 campaign; "Dinner and a Debate"; at least two...