How is a National ID any different than things now such as a Social Security Card, a Passport, credit card, birth certificate or any other of the host of ID currently used except that it would be more effective by establishing consistent standards? If you think a National ID reduces personal privacy just check a credit report sometime. What you fear is already a fact only the lack of standards in individual identification makes these outmoded methods susceptible to fraud and identity theft. IMO Current proposals might pave the way for closing some of these gaps.
A national ID is a mandatory imposition by the state into my affairs.
Social security is a ponzi scheme, refined robbery by the state.
Credit card info is a voluntary, contractual association between me and a business. I can end that at any time.
The first 10 amendments of the US consitution can be boiled down to three words: "Leave me alone!"
I didn't move into the bush, far, far away from idiot, intrusive government, to see some nitwit politician tell me that I need to carry an internal federal fascist passport.
The fact that there's lots of information out there is not at all the same as requiring me to carry national ID.