Someone remind me to avoid using humor in LaceUp's future posts. Takes all the fun out of it to have the statement over-analyzed to the point of inanity.
That said, if you're referring to a person who can be viewed as synonymous with their job, it's perfectly reasonable to correlate a poll about the job as equivalent to a poll about the person doing the job. Hell, it's possible even if the people who participate in the poll don't make that correlation.
If a corporation were to take a poll regarding what people thought of their customer service, and received overwhelmingly negative responses, the responsibility for that concern would fall squarely on whoever was in charge of the customer service department, even if not a single person who took the poll knew his name.
In the same sense, a poll discussing people's thoughts on the direction of the U.S. Government would tend to be seen to reflect on the POTUS, regardless of whether or not he was referred to within the poll itself.
But seriously. It was a joke. Not necessarily a very funny one, but a joke nonetheless. It really didn't need this level of scrutiny.