Rosie O'Donnell by Mark Von Holden/ Rosie O'Donnell by Mark Von Holden/

It's looking highly unlikely that Rosie O'Donnell will be the next new prime-time host on MSNBC. The cable news network has been courting O'Donnell for its 9 pm slot, which would put her against CNN's Larry King Live and Fox News Channel's Hannity & Colmes. There's little doubt that the opinionated O'Donnell would create some buzz as a cable news provocateur. But O'Donnell's insistence on a one-year deal has become a major obstacle in making that happen, according to sources inside NBC.

MSNBC has already sold much of its ad time for 2008 based on the low ratings that it currently gets in the hour. So it would take another year before the network would see a boost in its ad rates and revenue from any ratings growth that O'Donnell might deliver. And if she were only around for one year, it would be tough to turn a profit on a megabucks star salary. NBC News declined comment on the talks. - Reporting by Stephen Battaglio