Scenes of Mr. Sanders at rallies, surrounded by homemade placards saying “Dump TPP” close out the ad, as the narrator explains that Mr. Sanders cannot be bought by Wall Street because “he doesn’t take their money.”

It finishes: “For jobs. For us. Bernie.”

The Message

Mr. Sanders hits all the main arguments for his candidacy: He vilifies Wall Street for supporting trade deals, argues that he can stand up to big business because he does not take campaign donations from the industry, and contrasts himself with Hillary Clinton, who, in Mr. Sanders’s view, was not quick enough to denounce the Trans-Pacific Partnership. Mr. Sanders also sets up international trade deals as the ultimate culprits for continued job losses in the American heartland.

Fact Check

Calculating exact job deficits (or gains) from trade deals is an inexact science at best. Mr. Sanders cites the job losses from Nafta and the trade status with China to the Economic Policy Institute, a think tank affiliated with the labor movement. The Congressional Research Service, the nonpartisan arm of Congress that analyzes policy, found that Nafta did not cause the huge job losses critics have stated, as PolitiFact noted.

Where

Ohio and Illinois, two Midwestern states with industrial economies that vote Tuesday.

Takeaway

Mr. Sanders’s surprise victory in Michigan was largely attributed to his continued criticism of trade deals. Nearly 60 percent of voters in Michigan said that trade with other countries was more likely to take away jobs, according to exit polls by Edison Research. With these new ads, the Sanders campaign hopes to replicate that winning strategy by tapping into that sentiment in states with a high level of manufacturing jobs.