Who is influenced by political ads?...You?

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I've been intrigued enough by claims in political ads that I've gone online to research their allegations.

I think that's "influence."

I've never had an opinion directly changed by an ad, although cumulatively the quality of the McCain attack ads has lessened my respect for him.

I wasn't going to vote for him anyway, but the ads made me feel more confident that I made the right choice.