CNN’s Brian Stelter has somehow managed to make a career out of bashing Fox News. CNN bills Stelter as the network’s “chief media correspondent,” but tune into his Reliable Sources show any Sunday, and Fox News is almost always the main topic of conversation.

So when a new study came out from University of California, Berkeley professor David Broockman and Yale University professor Joshua Kalla showing that Fox News viewers who were paid to watch CNN for a month were slightly more likely to have liberal views on some issues, Stelter immediately booked them for his show.