I've been saying it for years. We are more than capable of creating an official USA app that every American can download, test their knowledge on a topic, and vote. If X.com can implement polling, why can't the US Gov? In my opinion, they want to portray the illusion of democracy, not actually implement it.
There are many Americans that can't or won't download a "USA app". Owning a smartphone must not be a requirement for participating in democracy.
And if all you want is political polling, every elected representative does this already (well, they generally pay someone else to do it). So I'm not sure what it would mean for the US gov to do it separately. Do you imagine that a "non-partisan agency" like the CBO would do it with taxpayer dollars, as a publi service for the politicians who would still vote however they do?