As far as I know I'm not required anywhere in the US to carry any form of picture ID. Yes I have to have a Drivers License to drive, but that isn't official 'ID' though it is used as such. That is why when you perform certain tasks, go to court or airports they have signs informing you that you must have picture ID to proceed further. It's also why when a cop stops you if you are walking down the street they ask, "Do you have any ID?" and not "Vhere are your papers, comrade?" Yes they can detain you until your identity is confirmed but it isn't against the law to not have ID. So screw a national ID system, that frankly would be flawed from the get go.