I don’t have any clips off hand and really don’t want to subject myself to an unnecessary dose of US news media haha… You are right about it not normally being played behind the in studio talent, but you can pretty quickly notice the semi-permanent background track once you start using paying attention to how they construct a “packaged segment” that has been pre-recorded and pre-produced, ready to cut to from the in studio talent.

It’s way more obvious when it’s a wedge issue like gun rights, drug legalisation, abortion, or anything political.