Yes, it was anonymous. To address your point, the question was not framed as "do you support higher or lower taxes" in a vacuum but rather "would you be ok with incurring an additional cost in the form of higher taxes to support Biden's economic agenda," which is broad and encompasses his environmental policy, foreign policy, etc. The former question being one of preference on policy, similar to what was asked of your class (and yes, pretty sure most kids in Penn taking an economics class would probably also be anti-union). The latter question, at least in my mind, seemed to be getting at the tradeoff between costs and benefits of a particular candidate (Biden), not a specific policy. In other words, one could be against higher taxes but still vote "yes" to the question because orange man bad, which I suspect constituted a sizable contingent of the "yes" votes. As such, I read the question as being a rough proxy question for "are you leaning Biden over Trump" (although it obviously would not be completely indicative as there are important issues to voters that are unrelated to economic agenda, or at least perceived as such), which is why I was surprised nearly half of the class voted "no" in an institution where students are so outwardly anti-Trump. But that's just my take.