Hillary and Barack both officially announced in January 2007. Of course, both were "running" long before that. If Obama is declared the winner by 11PM ET on Nov 4, I imagine that Mitt Romney and Mike Huckabee will announce their candidacies on Faux News at 1101PM ET. If McCain wins, Hillary will announce hers on CNN within minutes.
Face it, politics is now a niche. Just like there is an NFL Network which covers the NFL 24/7 and an NHL Network with covers the NHL 24/7 and TMC which shows classic movies 24/7 and SoapNet which broadcasts soaps 24/7, there will be an MSNBC which covers politics. Maybe not 24/7,but close to it. They were spinning their wheels for nearly a decade by trying to imitate CNN. Instead, they decided to imitate Faux and their ratings actually began to show some life.
If Obama is indeed elected, it will be a remarkable change. Our federal government will shift on Jan 20 2009 from one of the most ideologically conservative in history to potentialluy one of the most liberal/progressive in history. That is a big story.
There will always be folks who don't give a flying fig about government/politics. Only 50-60M viewers watched the debates. That's 250M who didn't bother. Just as there are always folks who never watch/discuss/analyze sports or movies or radio or -gasp - network television.