I believe he said 8 of the 19 and he didn't say which party but they were registered in Florida and Virginia.
Stealing Elections: How Voter Fraud Threatens Our Democracy
by
John Fund
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The Florida Fiasco of 2000, with hanging chads, butterfly ballots and Supreme Court intervention, forced Americans to confront an ugly reality. The U.S. has the sloppiest election systems of any industrialized nation, so sloppy that at least eight of the 19 hijackers who attacked the World Trade Center and the Pentagon were actually able to register to vote in either Virginia or Florida while they made their deadly preparations for 9/11.
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"At least eight of the nineteen hijackers who attacked the World Trade Center and the Pentagon were actually able to register to vote in either Virginia or Florida while they made their deadly preparations for 9/11."
John Fund on National Review
http://www.freerepublic.com/focus/f-news/1244236/posts
One does not register by party in Virginia.
No party registration in Virginia