They're based on calling phone numbers, which are tied to identities, and the President has access to the NSA databases that correlate everyone's identities wi

They're based on calling phone numbers, which are tied to identities, and the President has access to the NSA databases that correlate everyone's identities with their phones, IP addresses, etc. If people in Congress or the President wanted to, they could absolutely find out who answered in polls that they'd vote for a candidate.