Yes, Vote Fraud's Real

There is no need to play the 'numbers game.'  The photo ID requirement is a matter of principle. 

Anyone with common sense ought to be able to appreciate that voting must be conducted in an orderly manner, a manner to inspire confidence in the citizenry, and that only citizens who have registered to vote and have satisfied the minimal requirements of age, etc., are to be allowed into the voting booth. Given the possibility of fraud, it is therefore necessary to verify the identities of those who present themselves at the polling place. To do this, voters must be required to present a government-issued photo ID card, a driver's license being only one example of such. It is a reasonable requirement and any reasonable person should be able to see it as one.

But if you want to play the 'numbers game' voter fraud  does occur often enough to be a serious problem.