The ad accuses Kasich of “holding out for a last-second shot at blocking out the grass roots.”

“Millionaires working side by side with George Soros are bankrolling his super PAC, while Kasich voted against the Second Amendment and expanded Obamacare in Ohio, costing taxpayers billions,” the TV and radio spot says. “So given John Kasich’s liberal record, it’s no surprise his campaign isn’t rebounding. Because John Kasich won’t play in Wisconsin.”

Cruz is in contention to edge out Donald Trump for first place in Wisconsin next week and has personally kept his focus largely on Trump, but Kasich, who hails from a fellow Midwestern state, does have institutional support from some prominent Republicans in the state, including former Gov. Tommy Thompson.