“A study by the Associated Press found that legitimate votes have been rejected after many states passed tougher voter ID laws in order to prevent fraud. ... When Edward and Mary Weidenbener went to vote in Indiana's primary in May, they didn't realize that state law required them to bring government photo IDs such as a driver's license or passport.”

URL: 
http://www.csmonitor.com/USA/Latest-News-Wires/2012/0708/What-could-tighter-voter-ID-laws-mean-in-November