"The goal is that everyone who wants a job can find a job," it continues while a woman dresses a mannequin in a storefront. That's the work of Simon Krzic, a videographer based in Vrhnika, Slovenia.

All the footage is hosted by iStock, an international company headquartered in Canada.

"Gov. Walker is so committed to outsourcing that's he's even outsourcing stock footage jobs overseas," said Scot Ross, executive director of the liberal group One Wisconsin Now. "Gov. Walker's got a better chance of convincing us Wisconsin's landscape is dotted with mountains than convincing us he's been anything but a failure on jobs, education and skyrocketing student loan debt."

The Walker campaign did not immediately respond to a request for comment on how the footage for ads is selected.

Whether the campaign's attacks on Burke's role with Trek are intended as criticism of the candidate or of the practice itself, they've pushed outsourcing to the forefront of the state's political conversation.

And now with the release of every new campaign ad — for the governor's race or any other election — viewers can play a version of "I Spy": spot the footage that's not from Wisconsin, and track down its origins.

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