04/30/2012 11:11 pm ET Updated Jun 30, 2012

Oil Drilling Advocates Drive Presidential Debate With Ads

While polls show the economy as the top concern of voters, a review of political attack ads suggests a different issue dominates: energy.

Americans for Prosperity, an organization backed by oil interests, last week began airing its third television commercial since November, a campaign worth $6.1 million, attacking Obama's green energy policies.

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