"Union busting is disgusting!" has become a frequent cry from union protesters in Ohio, Wisconsin and other states whose Republican-controlled governments have passed laws limiting unions' organizing powers in the past few years.
But Michigan, Stewart said, should be able to do better.
"Dude, you're from Michigan," he said. "Detroit. 8-mile."
"If you want to win the climactic rap battle, you've got to put some effort into it!"
He then dons a knit beanie and shows them how it's done. (It almost works, too.)
The bit starts at 4:40.
Celebrity Breakups and divorces of 2014 [PHOTOS]