^There's also a Yahoo article I believe out there. If the link doesn't work it's on Forbes as well.
Cleveland can't even win at being bad. Ranked #6 for those who can't or don't want to flip through the rankings. Apparently a strong run way back in the '50's and '60's by the (old) Browns kept them from the #1 spot. It says "2013" so I think Forbes really screwed up the rankings if that's the case. "All time" I can see them getting away with it.
Cleveland sports teams have played 140 seasons (in the 4 major sports leagues) since their last professional sports team championship. 227 seasons all time, 6 championships.
Just found this interesting. Carry on with your offseason endeavors.