In September, Democrats outspent Republicans in advertising by over $31 million across 20 highly contested US House races, data from ad tracking firm AdImpact reveals. Democrats held the advantage in 17 of these races, with each drawing between $5 to $10 million in ad spending. Notably, Alaska and Pennsylvania had two toss-up contests that exceeded $10 million in ad spending.
The top 20 races with the most ad spending were spread across the country, with California, New York, Pennsylvania, Michigan, and Arizona hosting multiple competitive contests. California and New York emerged as advertising hotspots, accounting for nearly a quarter of all ad spending in House races in September, with California leading at over $30 million and New York following closely at $28.5 million. Pennsylvania, Michigan, and Arizona also experienced significant ad bombardment, with $20 million, $17 million, and $13 million spent, respectively.
Overall, a total of approximately $245 million was spent on advertising for US House races in September, encompassing all advertisers, campaigns, and outside groups from both parties. Democrats outpaced Republicans in ad spending, with a total of $153 million compared to Republicans' $91 million.