Kate SantalizAdd Axios as your preferred source tosee more of our stories on Google.Illustration: Allie Carl/AxiosAmerican Action Network is launching a $3 million ad campaign in four House districts, Axios has learned, as Republicans sharpen an affordability-focused message ahead of the midterms.Why it matters: Republicans are trying to make affordability a defining issue of the November elections, betting voters will reward candidates who can claim credit for lowering costs and cutting taxes.But they still face significant headwinds with that message. Just 16% of adults rate the economy "excellent" or "good," according to a Gallup poll from late last month.Republican leadership has been urging their members to tout the wins from the "big, beautiful bill," later dubbed the Working Families Tax Cut Act.American Action Network is closely tied to the Congressional Leadership Fund, a super PAC linked to House Speaker Mike Johnson (R-La.).Driving the news: The ads will run for two weeks on broadcast and digital in Florida, Virginia's 2nd District and Washington's 3rd District.In Washington, AAN is going after Rep. Marie Gluesenkamp-Perez (D-Wash.), casting her as a tacit supporter of a newly passed state income tax. The group is also airing a spot backing Republican challenger state Sen. John Braun.In Florida, the group is targeting Reps. Jared Moskowitz (D-Fla.) and Kathy Castor (D-Fla.) as part of its push to link Democrats to policies it argues raise costs for working families.In Virginia, AAN is defending Rep. Jen Kiggans (R-Va.) with a positive ad highlighting her work on veterans' and affordability issues.What they're saying: "Conservatives are fighting every day to lower costs, but liberals at every level of government keep finding new ways to tax working families," AAN President Chris Winkelman said in a statement.