Absolutely a possibility. Depends on how often people are using VPNs, whether there's a distinct difference between political ideology and VPN usage, and the average distance to a VPN exit point. I think it's fairly safe to assume a similar distribution of VPN usage across political bounds and generally speaking geographically distributed fairly evenly, with perhaps major cities and higher educated areas using VPNs slightly more often but with the exit point also being closer to the true point of access.