Do you need Obama coverage 24 hours a day? In several markets, Comcast cable is launching an all-Obama, On Demand channel. (In D.C., it's channel 963). Leading up to Inauguration, the channel will offer a number of Obama-related programs, according to a release: "Barack Obama’s most famous speeches to date, from his keynote address at the Democratic National Convention in 2004 through his election night victory speech in Grant Park; Barack Obama biography; Michelle Obama’s 2008 Democratic National Convention speech; a tour of the White House; and the history of Air Force One." Dish Network launched an all-Obama channel during...