Affiliate Marketing Secrets

It is now established that Obama has a Connecticut Social Security number.
Snopes.com explains that the clerk misread Obama’s SSN application and changed the first digit of the ZIP code from a 9 to a 0, making it a CT ZIP code.
But wouldnt’ the clerk notice that Obama filled in the state as HI and not CT? Isn’t this what redundant information is for? To check for errors like this?
Why would the clerk read HI as the state, but then read a CT ZIP code without realizing it was an error?
What’s the real reason why Obama has a CT SSN?