By Friday, both campaigns tried to tone things down by pulling negative radio ads off the air, but in that time Obama saw his support among white voters diminish.
Networks have seen that when viewer's favorite shows go off the air for an extended period of time--think the Walt Disney Co. (nyse: DIS - news - people )-owned ABC's Lost and CBS 's (nyse: CBS - news - people ) Jericho--it's hard to get those viewers back.