Are voter fraud fears overblown?

http://features.csmonitor.com/politics/2008/10/19/are-voter-fraud-fears-overblown/

What do you think? Even if some of the registrations were fraudulent (e.g., Mickey Mouse), won't that get sorted out when the voters show up to vote. Presumably, the fraudulent registrations won't turn into fraudulent votes especially in the 17 states where newly registered voters must show up with ID.