As I said before, I think it happens. Does it happen often and does it happen that would affect the results? The dems say it never happens and the republicans say that it will eliminate all vote fraud. However, it is such an easy check to make people show picture ID's. A very high percentage of people already have picture ID's in the form of a drivers license. People that don't drive, many have state issued ID's, passports, etc. for ID purposes. It is only a very small percentage that don't have ID's or refuse to get one. Will it elliminate vote fraud completely? No, but what really will.
It is what you learn, after you know it all, that counts.