Lots of different polls lately have showed solid support among the public for calling witnesses in principle. Sometimes the numbers are in the upper 50, sometimes the upper 60s. This new one from YouGov is right in between,at 63/23.

But few of those polls then take the logical next step of asking which witnesses specifically should be called. John Bolton and Hunter Biden are the two most obvious candidates, but what about Mick Mulvaney? Mike Pompeo?