I don't think that's true for most of them. Most people are computer savy and they've gone through procedures before to get Obamaphones, food stamps, housing subsidies,..... I suspect that it's just like the rest of us. Putting all of that information on line in a new, untried and untrusted system is crazy. Keep in mind most of the people they're trying to sign up do function somewhat in society.
Lets just hope they show a little more cerebral effort than they do when it comes to voting.
Have you interviewed many job applicants recently? Most have difficulty responding to simple questions or filling out easy forms. Its actually surprsing when they manage to show up on time. But they have all the sitcoms memorized.