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Baldwin's debut ad in Wisconsin rips China

"In Wisconsin, we lead the entire nation in paper industry jobs. But China? They lead the world in cheating, and it's costing us jobs in Wisconsin," she says in the ad, filmed in a paper mill. "So I brought Democrats and Republicans together to put sanctions on China now and punish them for making billions breaking trade rules."

The ad underscores Baldwin's understanding that she needs to grow support behind her liberal base and appeal to the large number of economic populists in Wisconsin. She'll face the winner of a crowded Republican primary that won't be decided until August.

The campaign did not disclose how much money is behind the ad or where it's running. The Hill rates the race a "toss-up."