In Wisconsin, a campaign narrator laments that “groceries, utilities, everything’s getting more expensive and Congressman (Derrick) Van Orden is adding to the list. He voted for the costly Iran war and spiking gas prices.”

In Nebraska, Democratic candidate Chris Backemeyer says families are drowning. “And Mike Flood opened the gates. Flood voted six times for Trump’s tariffs and the Iran war, flooding us with higher prices on groceries, gas, cars and medicine, costing us a thousand dollars more a year.”

In Iowa, the advocacy group Vote Vets Action Fund says Republican Senate candidate Ashley Hinson voted five times for the Iran war, “giving us record prices for gas and fertilizer.”

The spots are a handful of examples of how Democrats and aligned advocacy groups are wielding an unpopular war against Republicans as they seek to win back power in the House and Senate. The message is the culmination of a strategy Democrats launched in the spring, when they repeatedly forced votes on war powers resolutions aimed at ending the conflict. The measures had little practical effect, but they compelled lawmakers to go on record and take a stand. Under the 1973 War Powers Resolution, such measures can direct a president to remove U.S. forces from hostilities, and their privileged status in both chambers is what allowed Democrats — in the minority in the House and Senate — to force the votes.

Those votes are now being highlighted in campaign advertising across the country, according to an Associated Press analysis of data from AdImpact, which tracks media spending.

In some cases, the Republicans being targeted have never served in Congress and could not have voted on the war powers resolutions at all. Even so, Democrats are portraying them as destined to be rubber stamps for President Donald Trump on the war.

The AP examined data on broadcast and cable ads that aired from Sept. 1 through Oct. 14 in the most competitive midterm races, focusing on House and Senate contests rated as tossups or leaning Democratic or Republican by the nonpartisan Cook Political Report. A smaller number of streaming ads were also reviewed.

At least half of the 50 races analyzed featured Iran-related ads, most of them carrying household cost-of-living messages. In total, the ads aired on television more than 43,000 times between Sept. 1 and Oct. 14, at an estimated cost of $42 million. The AP identified the ads using AdImpact’s own issue designations along with additional analysis of the ads’ language.

Of the 65 unique Iran-themed ads identified by the AP, 61 stressed household cost-of-living messages such as rising prices for fuel and other goods.

Republicans, by contrast, have largely ignored the Iran war in their own advertising. Ron Bonjean, a Republican strategist, said their best strategy is to attack Democratic weaknesses so that voters conclude “this guy is worse.”

“In the end, you’re trying to get as many Republicans out to vote for you as possible and bring over some independents,” Bonjean said. “And talking about the Iran war is really not a winning message because you’re playing on the Democratic turf.”

The dominant themes in Republican advertising since Sept. 1 have been taxes and crime, followed by issues tied to character, healthcare and immigration.

Some Republicans have also sought to distance themselves from the conflict off the airwaves. In Michigan, Republican Senate candidate Mike Rogers has said the “war with Iran needs to end — and end quickly.” His opponent, Democratic nominee Abdul El-Sayed, has run ads arguing that a billion dollars day is going to a war “we have no business fighting,” and that he is running to “invest our tax dollars here in Michigan.”

In Maine, Republican Sen. Susan Collins emphasized in a recent debate that she voted nine times to end the conflict — a framing her Democratic challenger, Troy Jackson, countered by saying she voted five times to “make it happen.”

Altogether, the Senate has voted 14 times on resolutions seeking to halt or restrict Trump’s military action against Iran. The House has held six such votes since the conflict began in late February.

In the most recent House vote, seven Republicans sided with Democrats in favor of ending the war. Four of them are seeking reelection in highly competitive districts: Tom Barrett of Michigan, Brian Fitzpatrick of Pennsylvania, and Mariannette Miller-Meeks and Zach Nunn of Iowa. Barrett and Fitzpatrick had previously voted to remove U.S. troops from hostilities, but the yes votes were the first for Miller-Meeks and Nunn — a sign of growing weariness with the war.

Iran war ads made up roughly 5% of all television spots aired across the competitive races, but some contests have leaned into the topic heavily. The highest concentration was in California’s 48th Congressional District in the San Diego area, where roughly a third of the 12,000 ads aired touch on Iran.

Democrats there have seized on a remark made by Republican Jim Desmond in the early days of the war. In an interview on the Real America’s Voice network, Desmond said “no pain, no gain,” and added that he believed the higher prices were merely “a spike” that would come down once the U.S. eliminated Iran’s nuclear capability.

“No pain, no gain?” asks an ad from Democratic candidate Marni von Wilpert. “Tell that to a family filling up their gas tank.”

Desmond and the National Republican Congressional Committee, the House GOP’s campaign arm, responded with an ad that does not mention Iran, instead criticizing von Wilpert for raising taxes and fees during her time on the San Diego City Council. The ad says Desmond, by contrast, fought to lower costs and supports suspending the gas tax.

Close behind in Iran-related advertising are Virginia’s 2nd Congressional District, held by Republican Rep. Jen Kiggans, and Maine’s 2nd Congressional District, an open seat. Roughly a quarter of the ads in those districts touch on Iran, and both races are highly competitive.

Meanwhile, about 4,000 Iran-themed ads have aired in Ohio — roughly 4% of the total in one of the nation’s most expensive contests. Nearly all came from Democrat Sherrod Brown’s campaign and leaned heavily on pocketbook themes.

With the November midterm elections weeks away, the dueling strategies — Democrats tying the war to household costs, Republicans centering taxes and crime — now head into the closing stretch of contests that will help decide control of the next Congress.

This story was originally featured on Fortune.