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.

What they're saying: "Reps. Blum and Young know that Iowans overwhelmingly oppose taxpayer-funded giveaways to millionaires and billionaires, and they will be held accountable for their actions," said Tim Hogan, Spokesperson for Not One Penny.

But, but, but: New peril for moderate Dems in red states — many Americans are happy with Trump's economy.