The progressive group Not One Penny is launching a $5 million campaign against the GOP tax cuts that will run across the country. The first two ads, out today, target Iowa Republican Reps. Rod Blum (IA-01) and David Young (IA-03).

Why it matters: After the special election in Pennsylvania's 18th district, in which Republicans ditched their pro-tax plan ads, progressives are going on the offensive. Expect other left-leaning groups to try to use the GOP tax bill against Republicans in 2018, recognizing it might not be as great a selling point for them as they'd hoped.