Campaigns Blitz 9 Swing States in a Battle of Ads

The fall promises to bring wall-to-wall advertising. Already, commercial time in October during N.F.L. and World Series baseball games has been reserved for Congressional campaigns. And the Obama campaign is said to be inquiring about national television ads during the Summer Olympics, according to one person who monitors ad buying.

By November, breaking through the clutter will be difficult. But now, at least, some campaign ads seem to be seeping into voters’ minds.

Joni Robison, a homemaker from Las Vegas who said the stream of ads on her television has picked up tremendously, seemed to unintentionally echo the theme of a new anti-Obama ad running on heavy rotation here. The ad features a fictional mother of two whose adult children have moved back home because they were unable to find work. The mother says forlornly that the change Mr. Obama promised has not materialized.

“I have kids, and I don’t want to see their future compromised,” Ms. Robison said as she stood waiting with her daughter and husband for a Romney rally to begin. “I’m disappointed in some of the promises he made that he wasn’t able to keep. I’m disappointed in his performance.”