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“They got very heavy about a week or so ago.”

Apparently viewers noticed.

“I just hung up with a woman who was complaining about the McCain ads,” said Mr. Cornetta. “She told me she was switching stations unless we stopped running them. I had to explain that those are federally regulated, [which means] we have to run them.”

Kelley Harp, the campaign manager for Amendment 47, the right-to-work initiative, said his campaign hasn’t launched any advertising yet. It just seems like it, given the plethora of union-related spots.

“I didn’t notice any spike for the convention,” said Mr. Harp. “Having said that, I have [a digital video recorder], so I don’t pay attention to ads.”

Sean Lengell contributed to this report.